Lessors of Residential Buildings and Dwellings (NAICS 53111)

A short rollup primer for public-market and private investors. This NAICS industry (5-digit) contains exactly one national industry — 531110 — so the group and its child are effectively the same thing. This page gives the group's own ground-truth federal figures and then points you to the full 531110 leaf primer for the detail. Reported facts carry a numbered citation to the Sources list; figures labeled "estimate" or "judgment" are analytical, not reported data.

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1. Overview

This is the residential-landlord industry: owning apartments, houses, and townhomes and renting them to people who live in them. It is one of the largest real-asset industries in the country, yet as a business it is extraordinarily fragmented — most rental housing is owned by individuals with no employees. For an investor the appeal is simple: housing is essential, leases reprice frequently (usually once a year), and land is scarce in the best markets. The catch is that a landlord holding is two things at once — an operating business (rent minus costs) and a leveraged, interest-rate-sensitive asset — and both must go right.

Because this five-digit NAICS (North American Industry Classification System) industry has only one child, everything here is really about 531110. Read this page for the group-level picture, then go to the 531110 leaf primer for full economics, the investable universe, and how-to-invest detail.

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2. What's inside — and why the group equals its one child

NAICS uses nested levels: sector (2-digit) → subsector (3) → industry group (4) → NAICS industry (5) → national industry (6). Most 5-digit codes split into several 6-digit children. 53111 does not — it contains a single national industry:

When a 5-digit industry has exactly one 6-digit child, the two are identical in scope — same definition, same boundaries, same statistics. So 53111 covers exactly what 531110 covers: single-family rental homes, apartment buildings, townhomes and row houses, long-term residential hotels, and owner-lessors as well as "master lessees" who rent then sublease [1]. It sits in Sector 53 (Real Estate and Rental and Leasing) → Subsector 531 (Real Estate) → Group 5311 (Lessors of Real Estate) → 53111 → 531110 [1]. Apartment and single-family-rental (SFR) equity real estate investment trusts (REITs — companies that own income property and pass most profit to shareholders) are classified here, by the leasing they do [1].

It deliberately excludes non-residential leasing (531120), self-storage (531130), manufactured-home sites and vacant lots (531190), managing property for others for a fee (531311), and brokerage (531210) — plus short-term lodging (Sector 721) and care-integrated senior housing (Sector 623). See the 531110 primer for the full exclusion table. One practical point carried up to this level: because 53111 is real property, equipment-rental metrics (fleet utilization, residual/resale values) and licensing/royalty economics do not apply. The economics that matter are rent, occupancy, net operating income, cap rates, and mortgage leverage.

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3. How big it is — this level's ground-truth figures

Because 53111 equals 531110, its federal statistics are the child's statistics. From Histometrics' ingested Census data for NAICS 53111:

Average employment is roughly 4.7 workers per establishment — a low-headcount business, since even a 300-unit apartment community runs on a handful of on-site staff plus contractors [2].

Concentration (this level). Among the 55,397 counted employer firms, the largest 4 collect just 8.8% of receipts, the top 8 13.7%, the top 20 21.9%, and the top 50 29.8%; the Herfindahl-Hirschman Index (HHI, a 0–10,000 concentration gauge where anything under 1,500 is "unconcentrated") is only 34.9 [3]. That is near the theoretical floor — one of the most fragmented industries in the entire economy.

The undercount caveat — read before trusting any single number

The counted employer industry ($162.3B receipts, 55,397 firms) is a small slice of the real thing, and the concentration figures understate fragmentation. A landlord who owns one or two houses, has no payroll, and reports rent on a personal or pass-through return is a "nonemployer" and largely invisible to these business surveys [2][3]. The true scale of the asset base is far larger: the Census Bureau's 2024 Rental Housing Finance Survey counted about 18.97 million rental properties containing 49.72 million units, and roughly 45.9 million homes are renter-occupied nationally [5][9]. Any claim about this industry's true size should lean on those housing-stock surveys, not the ~74,000 counted establishments. (The child 531110 primer breaks the asset stock down by property size and ownership form; those distributions apply unchanged to 53111.)

Small-business threshold. The U.S. Small Business Administration's size standard for this industry is $34.0 million in average annual receipts (2023) — so practically the entire population qualifies as "small" [4].

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4. The investable universe

Value at this level concentrates exactly where it does for 531110, because they are the same industry. The public listed side is small and dominated by a handful of apartment and SFR REITs — AvalonBay (AVB), Equity Residential (EQR), Mid-America (MAA), Essex (ESS), UDR, Camden (CPT), Invitation Homes (INVH), and AMH — inside a residential REIT universe of roughly $113 billion of apartment REIT equity and ~$28 billion of SFR REIT equity as of early 2026 [10][11]. The private/institutional end is anchored by platforms such as Blackstone (its non-traded BREIT vehicle disclosed ~63,918 SFR homes at end-2025, and it took apartment owner AIR Communities private), Greystar (No. 1 on the National Multifamily Housing Council's 2026 owner/manager lists), and Morgan Properties (~110,475 apartments) [13][14]. Beneath them sit the ~15 million individually owned small properties that make up most of the industry by property count [5][7]. Full company table, tickers, and yields are in the 531110 primer.

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5. How the money works

Identical to 531110. Two linked cash-flow ideas run the whole industry:

• Rent → NOI. A property's operating profit is net operating income (NOI) = rent (× occupied units, plus fee income) minus property-level operating costs, before interest, depreciation, and corporate overhead [16]. Well-run apartment portfolios run 94–97% occupancy [11].
• NOI → value, via cap rates. Value ≈ NOI ÷ capitalization rate (cap rate). $1,000,000 of NOI at a 5% cap rate is worth $20.0M; the same NOI at a 6% cap rate is worth $16.7M — a ~17% value loss with no change in operations. Because cap rates track interest rates, higher rates cut property values even when rent and occupancy are healthy [20][21].
• Leverage. Properties are usually financed at 50–70% loan-to-value, so value swings hit equity harder. Investors watch debt-service coverage, loan maturities, and fixed-vs-floating exposure.
• The REIT wrapper. A REIT must distribute ≥90% of taxable income and meet asset/income tests; in exchange it pays little corporate tax (pass-through) [15]. REITs are valued on funds from operations (FFO) and adjusted FFO (AFFO) — cash-earnings measures that strip out real-estate depreciation — and on price-to-net-asset-value (NAV), not GAAP earnings per share [16].

The only child-level nuance to carry up: within this single industry, coastal/supply-constrained portfolios and Sun Belt/supply-heavy portfolios diverge on rent and NOI growth, and SFR names benefit from lower tenant turnover than apartments [11]. Full detail — including private-owner return sources and the FFO/AFFO mechanics — is in the 531110 primer.

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6. Demand drivers

Same as the child: household formation and demographics (large millennial/Gen-Z renter cohorts, immigration; ~45.9 million renter households) [9]; rent-vs-own math (a ~6.55% 30-year mortgage rate and stretched affordability keep marginal households renting) [24]; jobs and income, tempered by the fact that 49.7% of renter households were cost-burdened in 2023 [22]; migration toward the Sun Belt; and supply, where a recent construction wave (~484,000 multifamily completions in 2025) is the near-term swing factor against a long-run structural shortage [23].

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7. Regulation

Same regime as 531110: the federal Fair Housing Act bars discrimination, while deposits, habitability, eviction, and fees are mostly state and local [25]. Rent regulation is the biggest policy risk to apartment NOI in covered markets (e.g., Oregon's 2026 cap of 9.5%; California's AB 1482 at 5% + local CPI), though ~30 states preempt local rent control [24]. Listed REITs file standard SEC reports with FFO reconciliations; non-traded REITs have limited redemptions and higher fees and are not economically equivalent to listed shares [17]. Subsidy programs (LIHTC, Section 8), local zoning, and antitrust enforcement (the RealPage algorithmic-pricing case) round out the landscape [25].

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8. Consolidation

The industry is structurally fragmented and only slowly institutionalizing. Scale buys real edges (cheaper insurance and procurement, revenue-management data, capital-market access), strongest when units are geographically clustered. Two stories dominate: SFR was created as an institutional asset class out of the post-2008 foreclosure wave, and take-privates and mega-mergers keep reshaping the small public universe — Blackstone took AIR Communities private [13], and in May 2026 AvalonBay and Equity Residential signed an all-stock merger of equals (~180,000 pro-forma apartments, ~$52B equity value, expected to close 2H 2026) [12]. Even so, the eight largest public landlords together own only about 1.2% of all U.S. rental units [5][11].

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9. Risks

In order: interest-rate / cap-rate risk (the dominant one — higher required returns cut values even with flat NOI, magnified by leverage) [20][21]; refinancing / maturity risk against a ~$2.3–2.5 trillion multifamily debt stack [18][19]; oversupply / lease-up risk concentrated in Sun Belt submarkets [23]; expense inflation (property taxes and insurance outrunning rents); regulation and litigation (rent caps, eviction rules, antitrust) [25][24]; recession/affordability (nearly half of renters already cost-burdened) [22]; and liquidity/marks (private property is illiquid and appraisal-based values lag; public REIT shares can swing far from underlying asset value) [17]. Private direct owners add concentration and, for SFR, higher per-unit maintenance on dispersed homes.

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10. How to invest & outlook

Public routes: apartment REITs, SFR REITs, or diversified REIT index funds/ETFs — daily liquidity, diversification, and transparency at roughly 4.2% dividend yields, with stock-market volatility; value them on price-to-FFO/AFFO, dividend yield, and price-to-NAV (a wide NAV discount is a classic entry signal and the take-private trigger) [10][11][12]. Private routes: direct ownership of rental houses or small multifamily (control, tax shelter via depreciation and 1031 exchanges, but concentrated and illiquid); real-estate private-equity funds and syndications (LP interests, mind the layered fees and lagging valuations); non-traded REITs; and agency multifamily debt for yield without equity risk. Both public and private are fundamentally levered bets on rent growth, occupancy, and interest rates.

Outlook (judgment): modest, uneven growth rather than a national rent boom. The supply wave is peaking and rolling off, gradually relieving the weakest Sun Belt submarkets, while coastal/constrained markets keep better pricing power if employment holds. The swing factor is interest rates — easing without a recession is the bull case (tighter cap rates, higher values, less refinancing stress); a rate spike or recession is the bear case. Under the cycle, the structural setup is durable: an essential product, frequently repricing leases, a persistent housing shortage, and an asset class still ~70%-owned by individuals.

For full detail on every section above, see the child primer: NAICS 531110, Lessors of Residential Buildings and Dwellings — of which this NAICS industry is a one-to-one rollup.

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Sources

1. U.S. Census Bureau, 2022 NAICS Definitions — 53111 / 531110, Lessors of Residential Buildings and Dwellings, 2022. https://www.census.gov/naics/?details=531110&input=531110&year=2022
2. U.S. Census Bureau, County Business Patterns 2023 — NAICS 53111 (establishments 74,459; employees 348,544; annual payroll $19.365B). [Histometrics ingested federal data] https://data.census.gov/table/CBP2023.CB2300CBP
3. U.S. Census Bureau, 2022 Economic Census — NAICS 53111, concentration statistics (receipts $162.306B; 55,397 firms; CR4 8.8%, CR8 13.7%, CR20 21.9%, CR50 29.8%; HHI 34.9). [Histometrics ingested federal data] https://data.census.gov/table/ECNBASIC2022.EC2253BASIC
4. U.S. Small Business Administration, 13 CFR §121.201, Small Business Size Standards (531110: $34.0M average annual receipts, effective 2023). https://www.govinfo.gov/content/pkg/CFR-2023-title13-vol1/pdf/CFR-2023-title13-vol1-sec121-201.pdf
5. U.S. Census Bureau, 2024 Rental Housing Finance Survey (18.965M rental properties, 49.722M units). https://www.census.gov/programs-surveys/rhfs.html
6. U.S. Department of Housing and Urban Development & U.S. Census Bureau, 2021 Rental Housing Finance Survey — ownership by legal form (individuals ~70% of properties; individuals + LLC-type ~86%). https://www.census.gov/programs-surveys/rhfs.html
7. U.S. Census Bureau, Housing Vacancy Survey, Q4 2025 / Q1 2026 (45.867M renter-occupied units; homeownership 65.3%). https://www.census.gov/housing/hvs/current/index.html
8. Nareit, REIT Industry Fact Sheet — data as of January 30, 2026 (12 apartment REITs, $113.20B equity market cap, 4.21% yield; 2 SFR REITs, $27.96B, 4.23% yield). https://www.reit.com/data-research/reit-market-data
9. SEC filings, FY2025: AVB, EQR, MAA, UDR, CPT, ESS, INVH, AMH — portfolio scale and same-store operating results. https://www.sec.gov/cgi-bin/browse-edgar
10. AvalonBay Communities & Equity Residential, Merger-of-equals announcement (May 20, 2026): >180,000 pro-forma apartments, ~$52B equity market cap, expected close 2H 2026. https://www.sec.gov/Archives/edgar/data/915912/000119312526233392/d228019d425.htm
11. Blackstone Real Estate Income Trust (BREIT), 2025 Form 10-K (BREIT ~63,918 SFR homes; AIR Communities 27,000+ apartments). https://www.sec.gov/Archives/edgar/data/1662972/000166297226000032/breit-20251231.htm
12. National Multifamily Housing Council, 2026 Top 50 Owners/Managers; Greystar (No. 1) and Morgan Properties (~110,475 apartments). https://www.businesswire.com/news/home/20260423250026/en/
13. U.S. Internal Revenue Service, Instructions for Form 1120-REIT (90% distribution requirement; 75% asset and income tests). https://www.irs.gov/instructions/i1120rei
14. Nareit glossary, Net Operating Income, Capitalization Rate, Funds From Operations, Adjusted FFO; U.S. SEC non-GAAP FFO guidance. https://www.reit.com/glossary
15. U.S. Securities and Exchange Commission, Investor Bulletin: Publicly Traded and Non-Traded REITs. https://www.sec.gov/file/reitspdf
16. Federal Reserve Board, Financial Accounts of the United States (Z.1) — multifamily mortgage debt (~$2.45T, 2025). https://www.federalreserve.gov/releases/z1/current/
17. Mortgage Bankers Association, Commercial/Multifamily Mortgage Debt Outstanding, Q4 2025 (~$2.29T multifamily). https://www.mba.org/news-and-research
18. Federal Reserve Board, Financial Stability Report, November 2025 (cap rates below historical averages after rising from post-pandemic lows). https://www.federalreserve.gov/publications/november-2025-financial-stability-report-asset-valuations.htm
19. CBRE, U.S. Real Estate Market Outlook 2025 — Multifamily (cap rates ~5.5% peak in 2024). https://www.cbre.com/insights/books/us-real-estate-market-outlook-2025/multifamily
20. U.S. Census Bureau, Nearly Half of Renter Households Are Cost-Burdened (2023 ACS: 49.7%). https://www.census.gov/newsroom/press-releases/2024/renter-households-cost-burdened-race.html
21. U.S. Census Bureau, New Residential Construction (484,000 multifamily units completed in 2025). https://www.census.gov/construction/nrc/current/index.html
22. Freddie Mac, Primary Mortgage Market Survey (30-year fixed rate 6.55%, July 16, 2026). https://www.freddiemac.com/pmms
23. U.S. Department of Housing and Urban Development, Fair Housing Act Overview. https://www.hud.gov/helping-americans/fair-housing-act-overview
24. Oregon Dept. of Administrative Services, 2026 Rent Stabilization Percentage (9.5% cap); California Apartment Association, AB 1482 Statewide Rent Cap. https://caanet.org/topics/ab-1482/
25. U.S. Department of Justice, U.S. and Plaintiff States v. RealPage, Inc. (antitrust litigation and 2026 settlements). https://www.justice.gov/atr/case/us-and-plaintiff-states-v-realpage-inc

Data-vintage notes: Section 3 employer figures are Histometrics' ingested federal data for NAICS 53111 — County Business Patterns 2023 and the 2022 Economic Census (firm count, receipts, and concentration ratios) — and are identical to those for the single child industry 531110. Asset-stock and market context are drawn from the 531110 leaf primer (2024 RHFS; Nareit as of January 30, 2026; FY2025 SEC filings). Because 53111 has exactly one national-industry child, the group's scope, definition, and statistics equal that child's; source numbering is kept consistent with the 531110 primer, so a few numbers used only in the leaf detail are intentionally omitted here.