Real estate market research: six free datasets, then four local calls

Real estate market research for a local market means matching each question you have (how many new units are coming, who is moving in, what rents and prices are doing, what financing costs) to the public dataset that answers it, then interviewing local people for the parts no dataset records. Start with the free federal data, which takes an afternoon and shows you which questions are still open. Then call a broker, a property manager, a lender and an appraiser before you sign anything.

The order matters. Public data describes a whole county, usually months ago. The people who lease, lend on and value buildings there know what is happening this quarter on your blocks.

1. Match each question to the dataset built to answer it

Most local questions map onto six free federal sources. Each was built for one purpose, and its blind spots come from that purpose.

For judging published numbers in general, see secondary market research.

2. Read the supply numbers as a pipeline, with a lag

Permits are the earliest public signal of new supply. The Census Bureau says over 99 percent of privately owned residential buildings are built in places that issue permits, and it splits permits into single-unit, 2-unit, 3 to 4 unit and 5-or-more unit buildings. For a rental investor, the 5-or-more line is the one to watch.

A permit is permission, not a building. Census data summarized by the National Association of Home Builders shows multifamily buildings completed in 2024 took an average of 19.6 months from permit to completion, and buildings with 20 or more units took 22.1 months. So the permits issued over the last two years are roughly the deliveries you will compete with for the next two.

The methodology page adds two caveats. Since January 2022 the monthly estimates are not based on a probability sample, and places averaging fewer than six permits over recent years are surveyed only annually, with missing reports estimated from the prior year. Use annual totals for small towns, and treat one wild month with suspicion.

Short version: add up your county's last 24 months of 5-or-more unit permits, compare with earlier years, and divide by the existing rental stock. That ratio is your first supply question for local interviews.

3. Use the ACS for who lives there, and pick the right edition

The ACS answers demand questions: renter share, incomes, rent paid, recent moves. The Census Bureau publishes 1-year estimates only for areas with 65,000 or more people. Everything smaller, including census tracts, comes from 5-year estimates built from 60 months of responses.

The Bureau's guidance states the tradeoff: 1-year figures are more current and less reliable, 5-year figures the reverse. For a neighbourhood, use the 5-year estimate and check the margin of error beside every number before you quote it. A five-year tract median rent describes the area's renters well, and says little about what a renovated unit will lease for next spring.

4. Check jobs by place of work, then by place of residence

Rent growth follows jobs, so look at employment two ways. The QCEW counts jobs and wages reported by employers, covering more than 95 percent of US jobs, by county and industry. It is detailed and slow: the August 2026 release covered the first quarter of 2026.

LAUS is monthly and counts people by where they live, for counties, metros and many cities. When the two disagree, the gap is informative. A county gaining jobs while its residents' employment is flat may be importing commuters, who rent somewhere else.

To judge how exposed the area is to one dominant employer, use industry research.

5. Treat HUD rents and FHFA prices as benchmarks, not comps

HUD's Fair Market Rents look like rent data, and they are a specific kind. The FY2026 notice describes them as the 40th percentile gross rent (shelter rent plus utilities) paid by recent movers into standard quality units. The base is the 2019 to 2023 five-year ACS, trended forward. They exist to set Housing Choice Voucher payment standards, so they matter a lot if you rent to voucher holders and stand in poorly for asking rents otherwise. HUD also publishes ZIP-level Small Area FMRs where the data are reliable.

The FHFA House Price Index tracks repeat sales and refinancings of the same single-family homes, using mortgages bought or securitized by Fannie Mae and Freddie Mac. It comes monthly and quarterly, with ZIP and tract versions. It describes the single-family market around your property, and says nothing direct about what an apartment building trades for.

Then financing. Freddie Mac's survey put the average 30-year fixed rate at 7.40 percent as of October 15, 2026. That rate is for owner-occupied, single-family purchase loans with good credit and 20 percent down. An investor loan on an apartment building is priced differently, which is one reason to call a lender.

6. List what the numbers cannot tell you

After a few hours with these sources you will have a picture of the county and a list of gaps. They are usually these:

• Projects in the pipeline. Permits do not show which projects stalled or which new building starts leasing next door.
• Lease terms. None of the six sources reports concessions, free months, lease lengths or renewal rates.
• Block-level differences. A ZIP code can hold a street everyone wants and one nobody does, and the averages blend them.
• Current lending conditions. National rates say little about what a local bank will lend on a 24-unit building this quarter.

Here is a made-up example. Dana is weighing a 24-unit building. Nearby two-bedrooms advertise at $1,650 a month, and the HUD two-bedroom FMR is $1,480. The county permitted 1,800 units in 5-or-more unit buildings over the last 24 months, against about 400 a year before that. Then a leasing broker mentions that two new buildings offer one month free on 12-month leases. If Dana has to match that offer, her effective rent is $1,650 times 11, divided by 12, or $1,512.50. Across 24 units that is $3,300 a month less than the asking rents imply, and only $32.50 above an FMR that includes utilities her rent does not. No federal table would have shown her that concession.

7. Interview the four people who see the market every week

Each sees a different slice of the same market. Talk to at least one of each, and ask about the gap they can see.

1. A leasing or investment sales broker. Ask which buildings are leasing up now (filling for the first time), what concessions they offer, and which recent sales they would use as comparables. Brokers also see the deals that fell through.
2. A property manager. Ask about real renewal rates, how long units sit empty between tenants, and which unit types fill first. They see the costs and turnover an offering memo leaves out.
3. A local commercial lender. Ask what they will lend on a building like yours, at what loan-to-value ratio, and whether their appetite for the area changed this year.
4. An appraiser. Ask which sales they treat as comparable and what adjustments they make. Your lender will rely on an appraisal, so hear this view before one is ordered.

Bring your numbers from steps 1 to 5 to each call. "The county permitted 1,800 multifamily units in two years; where are they?" gets a far better answer than "how is the market?" Primary market research covers how to plan the interviews, and market entry research covers a market that is new to you.

Disagreement is useful. If the broker says rents are firm and the property manager says renewals are slipping, you have found your next question.

Your next step

Pull your county's last 24 months of permits and your tracts' ACS 5-year figures, then write down the four gaps from step 6. Instant Expert can find people matching a description such as "property managers running apartment buildings in this county" and send them paid invitations for a short call or a written answer; you pay only if someone books or answers. The directory has pages for real estate brokerage owners, multifamily property operations experts and mortgage origination operations experts.