Rent Comps for an Apartment Deal: How to Pull and Adjust

To pull rent comps for an apartment deal, find recent asking or signed rents at three to six similar buildings near yours, match them by unit type, size, condition, age and what utilities are included, then adjust each one for the differences that remain. The adjusted range tells you what your units can rent for today and after any planned renovation.

Rent comps carry more weight than almost any other number in a pro forma, because the rent line drives income, value and the loan. This guide covers where to find comps, how to choose and adjust them, and how investors will read them. It uses a made-up example and is not appraisal advice.

What is a rent comp, and why does it matter?

A rent comp (short for comparable) is the rent at a unit similar enough to yours that a renter would choose between them. Sponsors use comps to answer two questions: are the current rents in line with the market, and what can renovated units rent for after the work is done?

Those answers flow straight into the deal. The rent roll and T-12 show what the building earns today. Your comps show what it could earn. The gap between the two is the rent premium in a value-add business plan, and it is usually the biggest single driver of projected returns.

Where do you find rent comps?

Use several sources and cross-check them. No single one is complete.

Rental listings. Current asking rents for nearby buildings, with photos you can use to judge condition. Note the date you pulled each one.
Calls and visits. Calling a leasing office as a prospective renter, or touring, tells you about specials, fees and what is included. Many sponsors do this for every comp.
Local property managers and brokers. Managers see signed leases and renewal rates. A property management company you plan to hire can often pull comps from its own portfolio.
Paid rent data services. These collect listing and survey data across a market. They save time but still need a reality check on the ground.
The seller's broker package. Useful as a starting list, but it was written to sell the building, so verify every comp in it.
Public benchmarks. HUD Fair Market Rents are estimates of 40th percentile gross rents for standard quality units in a metro area or county, and Small Area FMRs break them down by ZIP Code. The Census Bureau's American Community Survey reports median gross rent by area. Both are good for a sanity check and for areas with few listings, but they are not comps for a specific building.

For more free sources, see free data for apartment market research.

How do you choose the right comps?

Pick units a renter would actually compare with yours. Check these points before you adjust anything:

Same unit type. Compare two bedrooms with two bedrooms and one bath with one bath. Never average across unit types.
Similar size. Note square feet for each comp.
Similar condition and age. A renovated unit in a 1980s building is a different product from an original unit next door. For a value-add plan, you need comps for both today's units and the renovated ones.
Close location. The same neighborhood and school zone, with similar access to jobs and transit. A comp across a highway or in a different school zone may not be a comp at all.
Same utilities included. Note who pays water, sewer, trash, gas and electric. HUD's FMRs are gross rents (rent plus utilities) for this reason. If your building bills residents back for water through RUBS, compare total cost to the renter, not just base rent.
Effective rent, not just asking rent. Subtract concessions. One month free on a 12 month lease cuts the effective rent by about one twelfth.
Recent. Use current listings or leases signed in the last few months. Older data needs a note.

How do you adjust rent comps?

Adjust each comp toward your unit. If the comp is better than your unit in some way, subtract. If it is worse, add. Keep adjustments few and explain each one.

Made-up example. The subject is a renovated two bedroom, one bath unit of 900 square feet with a washer and dryer in the unit. The sponsor uses $0.50 per square foot for size, $150 for renovated versus original finishes and $25 for in-unit laundry. All numbers are made up.

Comp	Asking rent	Size adjustment	Condition adjustment	Laundry adjustment	Adjusted rent
A: 850 sq ft, renovated, no laundry	$1,450	+$25	$0	+$25	$1,500
B: 1,000 sq ft, renovated, laundry	$1,600	-$50	$0	$0	$1,550
C: 900 sq ft, original, no laundry	$1,275	$0	+$150	+$25	$1,450
D: 950 sq ft, renovated, laundry	$1,525	-$25	$0	$0	$1,500

The adjusted range is $1,450 to $1,550, and the average is $6,000 / 4 = $1,500. If the building's current units rent for $1,250, the supported premium for a renovated unit is about $250 a month. A careful sponsor might underwrite slightly below the average, for example $1,475, and show investors why.

Two warnings. First, adjustment amounts are judgment calls: check them against pairs of real listings that differ in only one feature. Second, if a comp needs large adjustments in several places, drop it and find a better one.

Asking rent, effective rent or in-place rent: which one do you use?

All three, labeled clearly.

In-place rent is what current residents pay, from the rent roll.
Asking rent is what similar units list for today.
Effective rent is asking rent minus concessions, and it is the closest measure of the market.

Your pro forma should start from in-place rent, move toward effective market rent as leases turn over, and grow from there at a rate you can defend. See rent growth assumptions for how to set that rate.

How do investors read your rent comps?

Experienced investors look for the grid, not just the conclusion. Make it easy for them:

Show each comp's address or name, unit type, size, rent, date and source.
Mark which comps are renovated and which are original.
Show the adjustments and the adjusted range.
Compare the premium you assume with the premium the comps support.
Note the local vacancy picture. The Census Bureau reported a national rental vacancy rate of 7.6% for the third quarter of 2026 (Census HVS), but your submarket can be very different.

If your assumed rents sit at the top of the adjusted range, say so and explain why. A sponsor who shows the weak comps alongside the strong ones builds more trust than one who shows only the strongest. For the rest of the underwriting, see multifamily underwriting basics.

How DoorRaise fits in

DoorRaise helps sponsors raise equity for apartment buildings with 5+ units from their friends and followers under Rule 506(b) or 506(c). DoorRaise does not pull comps or set your rents: the rent assumptions are yours to make and support. What DoorRaise does is the raise around them. It prepares the standard offering documents, forms the LLC, files Form D and state notices, and verifies accredited investors for 506(c). Investors fund by wire into escrow at Enterprise Bank & Trust, an FDIC-insured bank. Fees are $1,500 to set up (non-refundable), $5,000 at closing (only if the deal closes) and $3,500 a year, with no percentage of the raise and no part of the promote.

Raise your apartment deal from the people who already follow you.

DoorRaise is built for apartment buildings with 5 or more units: one link for the deal, escrow until closing and a standard fee card.

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FAQ

How many rent comps do I need?

There is no fixed rule. Three to six good comps per unit type is a common working range. A few close matches beat many loose ones.

Can I use HUD Fair Market Rents as comps?

Use them as a benchmark, not as comps. FMRs are 40th percentile gross rents for a whole metro area or county, so they do not describe your building or its renovated units.

Should I count concessions?

Yes. Subtract them to get effective rent. A building offering a month free is renting for less than its asking rent.

How old can a comp be?

Prefer current listings and leases from the last few months. If you use older data, label the date so investors can judge it.

What if there are no good comps nearby?

Widen the area slowly, lean on property managers who know the local market, and use public benchmarks as a cross-check. Say plainly in your materials that comps were thin.

Next step: read how to read a rent roll and T-12 to compare your comps with what the building earns today.

Sources

This article is general information, not legal, tax, appraisal or investment advice. Check your assumptions with your own advisers. DoorRaise is not a law firm, broker-dealer, investment adviser or funding portal.