# A Chicago investor’s guide to office and medical-office investment

Canonical: https://chicagocommercialfunding.com/learn/office/
Markdown: https://chicagocommercialfunding.com/learn/office/index.md
Resource ID: a-chicago-investors-guide-to-office-and-medical-office-investment
Published: 2026-10-21
Updated: 2026-10-21
Attribution: Chicago Commercial Funding Editorial
Topic: office
Asset types: Office
Investment stage: Evaluate
Experience level: Foundation

Evaluate office and medical-office investments through tenant demand, usable building design, lease cash flow, recurring capital, and funding resilience. Occupancy alone does not establish durable investor income.

Office and medical-office investments work when the property can retain or replace suitable tenants at rents that cover operating costs, recurring leasing capital, building investment, and financing obligations. Occupancy is only one measure. The investor must understand who needs the space, how the building serves those users, what the leases actually require, and how much cash the owner must commit before dependable income arrives.

Chicago's central business district, neighborhood professional buildings, suburban campuses, and medical-office locations can present very different opportunities. A market label cannot substitute for a property-level plan. Start with the user and the building, construct the lease-level cash flow, test realistic failure scenarios, and only then decide how much debt and equity the investment can support.

This guide provides an original acquisition-to-ownership framework. Its examples are hypothetical, with no current market rents, cap rates, loan offers, or actual transaction outcomes implied. Historical public documents illustrate commercial mechanics. The actual lease, building, jurisdiction, and proposed business plan determine the diligence required.

## 1. State the business plan in one testable paragraph

An investment thesis should explain the tenant audience, the property's competitive advantage, the required improvements, the expected capital timeline, and the eventual exit. “Buy at a low basis” is incomplete. A low acquisition price may compensate for difficult leasing or major repairs; it does not establish that the operating plan works.

An example thesis might be: acquire a small professional office building with an existing diversified rent roll, renew several near-term expirations through modest improvements, and retain sufficient cash for a major tenant departure. Another might be: acquire a vacant building only after obtaining credible contractor pricing and documented tenant demand for smaller suites. These plans have different capital needs and failure points.

Identify what would invalidate the thesis. If the target users require independent HVAC and the building cannot provide it economically, the strategy needs redesign. If a medical tenant's opening depends on an unconfirmed approval or hospital relationship, that dependency must be resolved. Set measurable milestones and decision dates before purchase rather than interpreting every later event as evidence the original thesis remains sound.

## 2. Define the tenant audience before describing quality

Office quality is relative to a user's requirements. A prestigious address may not offset an awkward layout, poor access, excessive total occupancy cost, or unsuitable service hours. A modest building can serve a narrow user group well if its premises, access, and operations match the business.

Interview leasing professionals and evaluate competing premises at the relevant size and condition. Record executed evidence where available, proposal terms, tours, objections, and lost-deal reasons. Distinguish asking rent from signed economics and both from collected cash. A broker's opinion is useful context, but the underwriting should identify which assumptions remain opinions.

GSA's space-intake process gathers detailed user requirements, illustrating that space decisions involve more than total area. Its federal process is not a private leasing requirement. [Review the requirements framework](https://www.gsa.gov/real-estate/planning-for-your-space-needs/space-intake-portal).

For a particular Chicago property, identify the actual demand geography and travel patterns. Do not assume a downtown building competes with every suburban campus or a medical practice can relocate as easily as an ordinary administrative office. Specialty demand can be resilient in some circumstances and constrained in others; the investor needs evidence for the specific user rather than a broad asset-class slogan.

## 3. Separate general office from medical-office requirements

Medical office can involve clinical operations, specialized equipment, patient access, licensing, infection-control planning, plumbing, electrical capacity, shielding, ventilation, or waste arrangements. Requirements differ substantially among uses. An administrative healthcare office and an outpatient procedure facility should not share one undifferentiated construction allowance.

Ask the prospective tenant for a professionally developed program of requirements. Identify which work belongs to the landlord, tenant, or base building; what approvals are needed; and who verifies compliance. Keep tenant equipment separate from improvements that become part of the property. Document ownership, removal, restoration, service, and replacement responsibilities.

CDC's environmental recommendations call for coordinated healthcare construction and infection-control planning where applicable. They should be applied by qualified professionals to the actual clinical setting, not copied as blanket specifications for every medical office. [Review the CDC recommendations](https://www.cdc.gov/infection-control/hcp/environmental-control/recommendations.html).

Specialized improvements can support a durable tenancy, but they can also have limited reuse value. The landlord should consider the cost of releasing to a different medical specialty or returning the space to general office use. A large original buildout is not automatically a dollar-for-dollar contribution to resale value.

## 4. Measure the building's functional capacity

Obtain reliable drawings and inspect actual conditions. Examine floor-plate depth, perimeter windows, structural bays, core position, ceiling conditions, circulation, common areas, and suite entrances. A large rentable area is not the same as an efficient user layout. Verify the measurement convention in leases and proposals.

Test plausible subdivision plans. Splitting a large vacancy may create new corridors, entrances, meters, controls, restrooms, or service requirements. More tenants can diversify rent but increase management and capital demands. Price the physical plan before assuming a higher per-square-foot rent will compensate for the loss of leasable area and added cost.

Evaluate accessibility, parking rights, transit usefulness, drop-off, deliveries, and after-hours access. DOJ guidance addresses accessible parking features and routes; the presence of marked stalls is not sufficient evidence of compliance. [Read the official parking guidance](https://www.ada.gov/topics/parking/).

List the building's hard constraints separately from correctable shortcomings. Signage may be inexpensive to improve; core geometry may not be. This distinction helps avoid spending money on cosmetic work while the actual leasing bottleneck remains unchanged.

## 5. Rebuild the rent roll from signed documents

A rent roll is a summary. Assemble leases, amendments, guarantees, side letters, work letters, notices, and relevant correspondence. Confirm the actual tenant entity, premises, rent schedule, commencement conditions, deposits, free rent, reimbursement terms, expiration, options, termination rights, and landlord obligations.

Create separate dates for signing, possession, construction completion, legal commencement, occupancy, and full cash rent. They may not coincide. A signed tenant can improve leasing statistics while still requiring months of owner funding. Keep leases awaiting delivery visible as obligations rather than treating them as already cash producing.

Historical filed leases show how detailed owner and tenant work obligations can be. The Principia lease is one negotiated example; it is not a Chicago standard form. [Review the lease and work letter](https://www.sec.gov/Archives/edgar/data/1510487/000119312518251837/d575899dex1018.htm).

Reconcile the documents to billing and collections. Ask why actual payments differ from scheduled amounts. Credits, disputes, temporary accommodations, unbilled recoveries, and delivery conditions can explain differences, but each needs support. Estoppels and counsel review complement this work; they do not eliminate the need to understand the economics.

## 6. Construct a lease-level cash-flow model

Build rows for each tenant rather than applying one average rent increase to the whole property. Show scheduled base rent, contractual abatement, expected collections, recoveries, direct charges, lease expirations, renewal assumptions, downtime, new leasing costs, and capital commitments. Keep property operating costs and debt service separate.

A hypothetical 30,000-square-foot building has three 10,000-square-foot tenants. Tenant A pays $30 per square foot, B pays $28, and C pays $26. Scheduled annual base rent is $840,000. If C receives three months of base-rent abatement during the model year, that reduces receipts by $65,000, leaving $775,000 before credit loss or other adjustments.

Assume collected reimbursements of $180,000 and other income of $5,000. Collected operating revenue becomes $960,000. If property operating expenses are $420,000, modeled NOI is $540,000 under this example's definition. State the definition and reconcile it to accounting reports; it excludes the later capital and financing items.

If building capital is $80,000, leasing capital is $120,000, and debt service is $280,000, cash before ownership-level items and additional reserve changes is $60,000. This is why a property advertising $540,000 of NOI cannot promise an equivalent amount of investor distributions.

## 7. Evaluate concessions as investment expenditures

A lease's face rent is a starting point. Free base rent, tenant improvements, commissions, moving contributions, legal work, and other obligations change the owner's economics. Identify what each concession affects and avoid deducting the same payment twice.

For a hypothetical 5,000-square-foot lease at $34 per square foot over five years with no escalations, scheduled base rent is $850,000. Four free months reduce receipts by approximately $56,667. If the owner funds $250,000 of improvements and $42,500 of commissions, undiscounted net lease receipts after those listed costs are approximately $500,833, or $20.03 per square foot annually over the full five years.

That number is not NOI and does not incorporate time value, operating expenses, vacancy before commencement, default, or exit. A monthly cash model should place each payment at its expected date. Compare full-term and earliest-termination outcomes where the lease permits an early exit.

Cousins' public leasing supplement separates several measures of leasing economics. It offers a useful example of definitions, not a pricing benchmark for Chicago properties. [Review the office leasing table](https://www.sec.gov/Archives/edgar/data/25232/000002523225000027/aearningsreleaseex9911q25.htm).

## 8. Plan rollover by event, not by average

Map expirations, option notice deadlines, tenant decision processes, and realistic marketing periods. A five-year weighted-average lease term can conceal a major expiration next year. Examine each concentration and the amount of income exposed at the same time.

For each significant tenant, build at least renewal and departure cases. The departure case includes downtime, unrecovered operating costs, improvements, commissions, legal and marketing costs, and possible building work. The renewal case may still require rent relief, upgrades, or a new term that affects exit value.

Suppose renewing one tenant costs $150,000, while replacement requires $650,000 before dependable rent. An expected-cost estimate based on a 70% renewal assumption is $300,000: 70% of $150,000 plus 30% of $650,000. The property must still be able to fund the $650,000 event if departure occurs. Probability weighting is a comparison tool, not a cash guarantee.

Record the evidence behind renewal assumptions: tenant business plans, discussions, utilization, alternatives, satisfaction, and required approvals. A tenant's willingness to talk is different from an executed renewal. Refresh the assumption as evidence changes and preserve the previous version so the owner can see how risk developed.

## 9. Read tenant concentration through economic relationships

Legal names can obscure shared economic exposure. Several entities may rely on the same parent, hospital system, industry, funding stream, or decision maker. Group exposures where evidence supports a common driver, while avoiding unsupported claims that every nearby healthcare practice shares identical credit risk.

For a hypothetical medical building with $1 million of base rent, three affiliated tenants paying $250,000, $150,000, and $100,000 create $500,000 of documented common-group exposure. Two independent practices that refer patients to that system are not automatically additional legal affiliates. Their dependency requires separate analysis.

Investigate the actual obligor, guarantor, lease security, business financial evidence, and operational relationship. A prominent sign on the building does not establish a parent guarantee. A tenant's strong business revenue does not necessarily mean that cash is available to the lease-signing entity.

Test an event rather than merely calculating percentages. How much base rent and recovery would disappear, what operating costs could fall, and what reletting capital would be needed? A medical tenant's departure may leave specialized space or equipment dependencies; quantify the reuse plan with qualified input before assigning residual value.

## 10. Inspect systems as part of leasing economics

Review heating and cooling, controls, electrical service, elevators, envelope, roof, plumbing, life-safety systems, and other relevant components. Record age, condition, service history, remaining-use assumptions, obsolescence, parts availability, and replacement scope with professional support. An equipment age alone cannot establish remaining life.

DOE distinguishes maintenance approaches based on reacting to failure, scheduled prevention, prediction, and reliability. This supports a deliberate program matched to equipment and operating needs. [Read the maintenance guidance](https://www.energy.gov/cmei/femp/operations-and-maintenance-challenges-and-solutions).

The financial analysis should connect systems to tenant performance. A repeated HVAC outage can affect service costs, tenant satisfaction, renewal, and concessions. A capacity limitation may prevent a proposed tenant's use. A replacement during occupancy can create temporary access or service constraints even when its cost is fully funded.

Prepare a capital schedule by project and year, with scope confidence and contingencies. Distinguish maintenance from replacement and landlord work from tenant obligations. Do not assume reimbursement rights without reading the leases. A contractor's estimate addresses a scope; it does not determine whether tenants must pay for it.

## 11. Build an operating arrangement the asset can afford

A manager's percentage fee does not describe all property operating work. Identify minimum fees, accounting, on-site coverage, maintenance personnel, emergency response, leasing, construction oversight, and owner asset management. Compare proposals on the same service scope.

Small offices can have concentrated minimum costs. If management costs $2,000 monthly even when 4% of collections would be lower, a building collecting $300,000 pays an effective 8% management fee before excluded services. Self-management may reduce checks written but introduces owner time, skill, and backup requirements.

Set controls for billing, approvals, procurement, vendor changes, bank access, and reconciliation. Review cash and arrears with operating variances and service performance. A manager who keeps expenses below budget by deferring necessary work may create a larger future problem. An owner needs to see what was accomplished and what remains unresolved.

Tie the annual operating budget to the business plan and tenant commitments. A planned medical buildout, new service hours, or subdivision can change utilities, cleaning, maintenance, and staffing. The operating forecast should evolve with the physical and leasing plan.

## 12. Test debt against the capital timeline

Financing should fit the investment's cash generation and execution risk. Review loan sizing constraints, amortization, maturity, covenants, reserves, draw conditions, guarantees, cash management, and extension requirements. A quoted interest rate is not a complete comparison.

Using the earlier hypothetical $540,000 NOI, a 1.35 debt-service coverage requirement would permit $400,000 of annual debt service in a simplified sizing test. That does not establish a loan amount without a rate, amortization, lender adjustments, and other constraints. It also does not assure enough cash for leasing capital.

A property with strong reported coverage can face a liquidity shortfall if $650,000 of reletting costs arrive before replacement rent. Separate lender-controlled reserves from unrestricted owner cash. Determine when and under what evidence the lender releases funds. A reserve balance is useful only within its actual permitted uses.

For a value-add plan, prepare a month-by-month sources-and-uses schedule through stabilization and a maturity test. Include slower leasing and higher cost cases. Avoid assuming refinancing will provide funds before the property achieves the performance required to obtain that financing.

## 13. Evaluate conversion and alternative uses carefully

An obsolete office is not automatically a feasible apartment conversion. Physical fit, unit yield, light, circulation, building systems, permissions, existing tenancies, budget, assistance, financing, and residential demand all require separate evidence. Price the alternative use from a defined plan.

A hypothetical $8 million acquisition plus $24 million of development and carrying uses creates a $32 million project. If supportable stabilized NOI is $1.5 million and an illustrative valuation test uses a 6% cap rate, indicated income value is $25 million. Cheap acquisition alone does not close that $7 million gap.

Treat conversion as a separate business plan rather than a fallback value inserted into an office exit model. A public policy initiative or proposed subsidy does not guarantee an award. Current official program conditions and project-specific approvals must support the assumptions before they become committed sources.

Compare continued office use, partial improvement, sale, and conversion using consistent dates and costs. Different teams may be capable of different strategies. The investor should understand its own execution capacity and the price another buyer could rationally pay, without assuming every alternative buyer can realize the same value.

## 14. Underwrite the exit before entering

A future buyer will evaluate tenant credit, remaining terms, rollover, building condition, capital needs, and financing conditions at that time. Do not assume an exit capitalization rate alone captures every difference between today's asset and the stabilized forecast.

Prepare an exit rent roll and capital schedule. If a major tenant expires soon after the planned sale, the buyer may underwrite that event even though it occurs outside the seller's holding period. A renovation that raises rent but leaves uncertain systems may not command the same pricing as a fully resolved plan.

Show selling costs, loan payoff, prepayment obligations, transaction adjustments, and ownership-level distribution rules separately from gross sale value. A property can appreciate while producing a disappointing equity result if capital calls, financing costs, and exit deductions were omitted from the initial model.

Use sensitivity analysis for combinations rather than isolated changes alone. Higher leasing costs, slower occupancy, and a weaker exit can occur together. State which downside the capital plan can withstand and which would require new equity, a negotiated lender solution, or a change in strategy.

## 15. Make the acquisition decision from an evidence file

A decision memorandum should contain the tenant thesis, physical constraints, lease audit, cash-flow model, capital schedule, operating plan, financing comparison, downside scenarios, and unresolved dependencies. Label facts, professional estimates, assumptions, and editorial judgments so later reviewers can understand the basis of the recommendation.

Assign each unresolved item a consequence and action. A missing minor invoice is different from an unpriced electrical upgrade required for the primary tenant. Establish whether the uncertainty can be resolved before closing, covered by a documented adjustment, funded conservatively, or accepted only at a different price.

For Chicago and its Illinois metropolitan area, confirm the actual parcel, municipality, taxing bodies, utility arrangements, and relevant authorities. Use local evidence when it affects economics or permission. A generic city narrative adds little if it does not change the investment decision.

The final decision may be to proceed, renegotiate, change the plan, or reject the asset. An office investment is ready when the owner can explain not only the expected income, but also who will fund and perform the work needed to sustain it through realistic tenant and building events.

## Keep a decision history after closing

Preserve the acquisition model and create dated updates rather than overwriting the original assumptions. When a tenant renews at a different rent or a systems project changes scope, show the effect on remaining capital, expected distributions, and the exit. Separate execution variance from a change in the underlying investment thesis. This record helps owners judge whether a manager is following the plan and whether the plan itself needs revision. It also improves future acquisitions: a forecast that cannot be compared with actual performance cannot teach the investor which assumptions were consistently optimistic.

## Source registry

- [Cousins Q1 2025 office leasing supplement](https://www.sec.gov/Archives/edgar/data/25232/000002523225000027/aearningsreleaseex9911q25.htm): accessed 2026-10-21
- [GSA space requirements process](https://www.gsa.gov/real-estate/planning-for-your-space-needs/space-intake-portal): accessed 2026-10-21
- [CDC healthcare environmental recommendations](https://www.cdc.gov/infection-control/hcp/environmental-control/recommendations.html): accessed 2026-10-21
- [DOJ accessible parking guidance](https://www.ada.gov/topics/parking/): accessed 2026-10-21
- [DOE operations and maintenance approaches](https://www.energy.gov/cmei/femp/operations-and-maintenance-challenges-and-solutions): accessed 2026-10-21
- [Principia filed lease and work letter](https://www.sec.gov/Archives/edgar/data/1510487/000119312518251837/d575899dex1018.htm): accessed 2026-10-21

## Related resources

- [Medical-office buildouts and specialized tenant requirements](https://chicagocommercialfunding.com/guides/medical-office-buildouts-and-specialized-tenant-requirements/)
- [Tenant concentration in medical-office investments](https://chicagocommercialfunding.com/guides/tenant-concentration-in-medical-office-investments/)
- [Building systems: HVAC, elevators and office capital exposure](https://chicagocommercialfunding.com/guides/building-systems-hvac-elevators-and-office-capital-exposure/)