The 21st Century ROAD to Housing Act: A Federal Framework for Build-to-Rent

Regulatory Certainty for the BTR and SFR Sectors

The build-to-rent (BTR) and single-family rental (SFR) sectors have operated for several years under significant political and regulatory uncertainty. State-level proposals, municipal moratoria, and federal commentary directed at institutional ownership of single-family housing have left developers, sponsors, and capital allocators without a clear federal framework within which to underwrite long-hold strategies.

The 21st Century ROAD to Housing Act — passed by the Senate 85-5 and the House 358-32, and now enacted into law — establishes that framework. Although public commentary on the law has focused principally on its restrictions concerning large institutional investors, the legislation also constitutes the most explicit federal recognition of the build-to-rent model enacted to date. The statute draws a deliberate distinction between investors who acquire existing single-family housing stock and developers who construct new rental supply, and it affords protection to the latter.

For a sector that has long operated without a defined federal rulebook, the principal contribution of the enacted law is regulatory certainty.

An Express Statutory Safe Harbor for Build-to-Rent

The most consequential provision of the law for the BTR sector appears in the statutory definition of "excepted purchase." The statute expressly excludes from its institutional-investor restrictions any purchase made:

"pursuant to a build-to-rent program where the large institutional investor purchases, constructs, or constructs and retains a newly constructed single-family home to be managed as a rental property, whether as part of a community made up exclusively of renter-occupied single-family homes or as part of a community made up of single-family homes that are both owner- and renter-occupied."

This provision represents a significant development. For the first time, federal law expressly recognizes and protects the BTR business model, including both fully rental communities and mixed-tenure horizontal communities.

A central change in the enacted legislation is the removal of the seven-year forced-sale requirement that had appeared in earlier proposals. The final version does not require institutional owners or BTR developers to dispose of newly constructed rental homes after seven years, or after any other federally prescribed holding period. That change is critical for long-hold BTR underwriting: the statute allows developers to construct, retain, and operate newly built rental-home communities without a mandatory exit date. The statute likewise does not impose a cap on the number of BTR homes a developer may construct and retain, and it does not condition the exception on rent restrictions, tenant-income tests, or affordability set-asides.

The strategic implication is meaningful. Capital that previously hesitated to underwrite long-hold SFR strategies now operates with explicit federal recognition. Funds, REITs, and joint ventures structured around new-construction BTR inventory function within a defined statutory lane rather than a regulatory gray area.

Scope of the Institutional-Investor Restrictions

The investor restrictions imposed by the law are substantive, but their scope is narrower than public commentary has suggested. A precise understanding of the statutory contours is essential for any sponsor operating at scale.

The 350-Home Threshold

The restrictions apply only to a "large institutional investor," defined as a for-profit entity that, alone or in concert with others, directly or indirectly holds investment control of not fewer than 350 single-family homes in the aggregate, excluding homes acquired through excepted purchases following enactment.

For most BTR developers and middle-market SFR aggregators, the threshold is unlikely to be triggered in the near term. For larger platforms, the threshold is meaningful but manageable, particularly in light of the breadth of the excepted-purchase categories.

Investment Control

The statutory definition of "investment control" is broad. It captures general partners, managing members, investment managers, advisors, and holders of more than 25 percent of any class of equity, subject to a limited passive-investor exception. Sponsors should anticipate aggregation across funds, separate accounts, and joint ventures under common control. Sponsors operating multiple vehicles or co-invest structures should consider undertaking a portfolio-mapping exercise against the statutory definition.

Definition of "Single-Family Home"

The restriction applies only to structures containing two or fewer dwelling units intended for residential occupancy by a single household. The definition has important product-type implications for BTR sponsors:

• Detached single-family rentals and duplex product fall within the restriction, subject to the build-to-rent and other excepted-purchase carve-outs.
• Townhome blocks of three or more attached units fall outside the restriction entirely. Because the statute defines "single-family home" at the structure level rather than the dwelling-unit level, a townhome building containing three or more attached units does not constitute a "single-family home" under the law, regardless of whether each unit is individually platted, separately deeded, or, in other contexts, sold to individual owners.
• Traditional multifamily and horizontal multifamily product structured as three-or-more-unit buildings likewise fall outside the restriction.

Accordingly, product type and site planning now carry direct federal regulatory consequences. Sponsors evaluating land plans for new BTR communities, and sponsors weighing detached-cottage product against attached-townhome product, should incorporate the statutory definition into underwriting and entitlement analysis from the outset. A community designed around attached townhome blocks of three or more units is not subject to the institutional-investor restrictions and may be acquired, developed, and held without reference to the 350-home threshold or the excepted-purchase framework.

Additional Pathways Under the Excepted-Purchase Framework

The law does not foreclose scaled SFR strategies; rather, it defines the parameters within which such strategies may be conducted. In addition to the build-to-rent safe harbor, the principal excepted-purchase categories include the following:

Renovate-to-Rent. Purchases of homes that do not satisfy core structural or building-code elements, where the investor undertakes improvements equal to at least 15 percent of the purchase price. This category preserves the value-add SFR thesis for sponsors targeting distressed or functionally obsolete stock.

Eligible Homeownership Programs. Rent-to-own and lease-purchase structures qualify where they include positive rent reporting, a contract treated as a consumer credit transaction secured by real property, and meaningful financial concessions toward purchase. Sponsors operating rent-to-own platforms should review program documentation against the statutory criteria.

Right-of-First-Refusal Programs. Programs that offer tenants a 30-day "first look" and right of first refusal, with optional financial support for purchase, qualify as excepted purchases.

Loss Mitigation and DPC Acquisitions. Mortgage servicers, lenders, and other entities with legal rights to the property may acquire through foreclosure, deed-in-lieu, or operation of law without triggering the restriction.

Investor-to-Investor Transfers. Purchases from another large institutional investor that lawfully held the home are permitted, preserving secondary-market liquidity for compliant portfolios.

Two-Year Wind-Down. Purchases from non-covered investors are permitted for up to two years following the effective date, providing a defined window for portfolio rationalization and strategic acquisitions.

55+ Communities. Newly constructed, renovated, or rental-converted homes operated as part of an age-restricted community satisfying HUD visitability standards are excepted.

Strategic Considerations

The 21st Century ROAD to Housing Act does not present the existential challenge to institutional SFR that earlier drafts and public commentary suggested. In practical terms, the law functions as a federal framework for the BTR model, recognizing purpose-built rental product and directing institutional capital toward new construction rather than aggregation of existing stock.

For sponsors operating at or near the 350-home threshold, the following matters warrant immediate attention:

1. Portfolio mapping against the investment-control definition, including affiliated funds, joint ventures, and co-invest vehicles
2. Product-type and site-plan analysis to identify communities in which attached townhome configurations would place new developments outside the institutional-investor framework
3. Program documentation review for any rent-to-own, right-of-first-refusal, or renovate-to-rent strategies to confirm alignment with statutory criteria
4. Acquisition pipeline review to identify transactions appropriate for closing within the two-year wind-down window applicable to non-covered seller transactions
5. Governance review of fund structures and management agreements to confirm investment-control attribution

The BTR and SFR sectors have, for several years, sought a defined federal framework. Congress has now provided one. Sponsors that move promptly to align platforms and pipelines with the statutory framework will be best positioned to take advantage of the opportunities the law creates.