The Treasury Department proposed a rule on Thursday that would bar the largest institutional owners of single-family homes from buying more of them, starting January 7, 2027. The proposal implements Section 1001 of the 21st Century ROAD to Housing Act, which Congress enacted in July. It was published in the Federal Register on Friday at 91 FR 66799, and comments are due November 23.
The prohibition itself fits in a sentence. An entity that is in the business of owning or renting single-family homes and controls at least 350 of them may not buy another one, or contract to buy one, unless the purchase falls into an exception. The Treasury press release describes the structure. The Federal Register notice runs 96 pages.
The exceptions are where the policy lives. Treasury wrote four main ones, plus several technical carve-outs, and each one answers a different objection to the ban. New construction gets a window. Renovation gets a safe harbor. Renters get help buying. Large owners get to keep trading among themselves. How those doors are sized will determine whether the rule changes the housing market or only its paperwork.
Who counts as a large investor
The threshold is 350 single-family homes, counted at the entity level and including homes controlled directly or indirectly. The rule defines investment control to reach the power to decide how a home is used, financed or disposed of, which means the count follows the decision maker rather than the legal title.
Two definitions narrow the reach. The first is the "in the business of" test: an owner counts only if the activity is for income or financial gain and is not incidental to a different business. A company that owns a handful of homes for its employees is not a large institutional investor. The second is the passive investor carve-out, which covers an entity that does not share directors or officers with the owning entity and holds no property control right over the homes. That provision matters for funds with limited partners that do not manage the properties.
The rule does not force anyone to sell. Homes acquired before the law took effect on July 11 stay with their owners. The ban applies to new purchases, which means an owner just below 350 can keep buying until it reaches the line, and an owner above it can keep everything it already has.
That design is a deliberate compromise. A forced divestment rule would have moved existing homes onto the market quickly, but it would also have raised legal questions and disrupted renters. Treasury chose a forward-looking ban, and the supply effect now depends on how much of the market the largest owners would have bought in the future.
New construction gets an 18-month window
The build-to-rent exception is the most consequential, because it decides whether the ban slows the construction of new rental housing. A large investor may buy a newly built single-family home if the home has never been owner-occupied and the purchase closes within 18 months of the certificate of occupancy. The homes must be rented to individual renters, not held for resale, land banking or speculative appreciation.
The exception also covers mixed communities that combine owner-occupied and renter-occupied homes, which matters because many builders sell only part of a project to an institutional buyer. Treasury proposed the 18-month period as a parameter and is taking comment on whether it is long enough, and on whether to add a minimum renter-occupancy period before a home can be sold.
The agency declined to extend the exception to older rental communities. It reasoned that "newly constructed" and "originally constructed" are not the same thing, so a 20-year-old rental neighborhood does not become new because an investor buys it. That reading keeps the exception tied to added supply, but it creates an exit problem. A builder that holds a build-to-rent community past 18 months cannot sell it to a 350-plus owner unless another exception applies. Its buyers are individual purchasers, smaller investors or another exempt path.
The Mortgage Bankers Association's Jamie Woodwell made that point in coverage of the proposal, saying the narrow window would restrict owners' ability to sell multifamily communities. The builders' counterargument is that the window is the price of the exception. Without a limit, an investor could buy any rental home and call it build-to-rent.
Two smaller exceptions: renovation and renter homebuying
The renovate-to-rent exception is aimed at the neglected house on the block, not the dated kitchen. To qualify, the home must fail structural or core-system building code elements at the time of purchase. The investor must then spend at least 15 percent of the purchase price, excluding land, on improvements that address those defects.
Treasury proposed a non-exclusive safe harbor at 10 percent for structural or core-system work that resolves all material deficiencies, which lets an investor show the rehabilitation is real while still reaching the 15 percent total. The rule also asks what "substantially rehabilitated" should mean, because the statutory exception uses that phrase without defining it.
The condition is the important part. A cosmetic flip does not qualify. The investor has to buy a house that fails a code standard, fix the failure and rent it. That is a narrower business than buying any older home and painting it, and the 15 percent figure is high enough that the math will not work in every market. In expensive metros, 15 percent of the purchase price can exceed the cost of the repairs the house needs.
The homeownership exception is a set of programs meant to move renters into ownership. Treasury proposes a safe harbor for meaningful financial support of at least the smaller of $5,000 and 2.5 percent of the purchase price for a renter who has lived in the home for at least five years, with the percentage rising to 3.5 percent for a renter of seven years or more.
The exception comes with two procedural rights. A renter gets a right of first refusal, and the investor must give the renter a 30-day first-look period before listing or marketing the home to other buyers. Programs must also provide positive rent reporting, so the renter's payment history can count toward a mortgage application.
The idea is to convert a rental relationship into an ownership path without requiring the investor to give the home away. The limit is scale. A $5,000 credit is meaningful for a first-time buyer with a modest down payment, but it is small against the price of a home in most of the markets where institutional owners concentrate. The exception will matter most where investors already run rent-to-own programs, not where they run plain rentals.
Liquidity is why large owners can still sell to each other
The fourth category is a set of technical exceptions that keep the market functioning. A large investor may buy from another large investor if the seller's acquisition complied with the rule, including purchases made before the ban took effect. Foreclosure-related acquisitions and loss-mitigation transfers are also excepted, as are purchases connected to previously contracted debts.
Treasury's stated reason is liquidity. If large owners could not trade among themselves, the value of their portfolios would depend on a much smaller pool of buyers, and lenders holding distressed properties would have fewer outlets. The agency said a contrary interpretation could impair market liquidity, which is the kind of sentence that invites a loophole argument.
The exception does not let a large owner grow. A transfer from one 350-plus owner to another keeps the number of institutionally owned homes the same. But it does let the largest owners reshape their portfolios, selling homes in markets where they want to exit and buying in markets where they want to grow, as long as the seller complied. Senator Elizabeth Warren warned that the proposal must not leave corporate landlords a way around the limit. The transfer exception is the one her staff is likely to read most closely.
Lenders doubt the supply math
The rule's supporters say it will free up entry-level homes for families who have been outbid by cash buyers. Its critics say the effect will be small, because institutional investors are a modest share of the market and the rule only limits future purchases.
The lender reaction in coverage was mixed. Christy Bunce of New American Funding backed the limit, saying it should give more families a fair shot and noting that cash buyers often beat financed buyers at the entry level. Dan Snyder of Lower called institutional investors the easy villain here while arguing they account for a relatively small share of purchases nationwide, and he noted that the rule does nothing about existing ownership. Joe Panebianco of AnnieMac said he does not expect a meaningful change to the housing stock.
Realtor.com's data gives the doubt some support. Its economists found large-investor buying activity down 31.8 percent this year compared with last, before the rule takes effect. Hannah Jones, a senior economist there, called the exceptions sensible guardrails rather than a surprise and said the effect could be more noticeable in local markets where institutional investors are concentrated.
That is probably the right frame. A national rule aimed at a national market will have uneven local effects. In neighborhoods where a few large owners compete for the same entry-level homes, the ban could change the bidding. In markets where institutional ownership is thin, it may not change much at all.
The deadline is tight
The comment period closes November 23. The prohibition starts January 7. That leaves Treasury about six weeks after comments arrive to review the record, settle the definitions and issue a final rule before the statutory date.
The statute does not wait for the rule. The ROAD Act sets the January 7 start, and the agency's job is to fill in the terms. If the final rule slips, the prohibition would still apply under the statute, but the exceptions and definitions that make it workable would be unresolved. That is the strongest argument for finalizing on time, and the strongest reason commenters will focus on the safe harbors rather than the ban itself.
Treasury has said this is the first of several rulemakings under the law. The next ones will fill in the rest of the statute. For now, the market has a date, a threshold and a set of doors. The 350-home line is easy to state. The doors will decide who walks through.
Primary sources
- U.S. Department of the Treasury, press release on the ROAD Act proposed rule, October 22, 2026.
- Federal Register, 21st Century ROAD to Housing Act Prohibition on Large Institutional Investor Purchases of Single-Family Homes, 91 FR 66799, October 23, 2026; comments due November 23, 2026.
- National Association of Realtors, summary of the proposed rule.
- National Mortgage News, lender reactions and the supply debate.
- HousingWire, analysis of the build-to-rent carve-outs.
- Yahoo Finance, Realtor.com economist comments and the 31.8 percent decline in large-investor purchases.