The 350-Home Rule Made Private Equity the Housing Villain — But Homebuilders Are the Real Winners

The Financial Times' September 26 campaign-language analysis lands on a finding that has been compounding all year: more than two dozen candidates in competitive U.S. House and Senate races have pledged to restrict purchases or ownership by private-equity firms and corporate landlords — more than double the level of any prior midterm cycle. That political surge is no longer aspirational. The 21st Century ROAD to Housing Act (P.L. 119-101) became law on July 11, 2026 without the President's signature, and its Title IX §901 (\"Homes are for People, Not Corporations\") sets a binding 350-single-family-home threshold above which institutional investors are barred from buying additional homes outright.

The build-to-rent carve-out inside the same section lets those same investors keep growing — but only if homes are built or substantially renovated for the rental community and (in some configurations) resold to an individual owner within seven years. The Brookings Institution modeled the convention with an even sharper figure: institutional owners hold barely3% of the national single-family rental stock, so a ban would free up only 1%–2% of owner-occupied supply on paper. The politics matter more than the economics — and that gap is the tradable insight.

Invitation Homes and American Homes 4 Rent are the two largest publicly traded single-family rental operators, and both are multiples of order above the ROAD Act's 350-home trigger. INVH owns approximately 86,139 single-family rental homes as of early 2026 and reported Q2 FY2026 total revenue of $748 million, up 9.7% year over year, with same-store renewal rent growth of 3.3% and blended rent growth of 2.7%. AMH owns roughly 59,000 homes and posted Q2 FY2026 total revenue of $470 million, up 2.8% year over year. Their Q2 operating results are strong; their political position is not.

The acquisition math has already changed. INVH spent $89 million in January 2026 to buy ResiBuilt, a build-to-rent developer — a move that internalizes the carve-out and gives INVH a vertical pipeline into the only legal growth lane for institutional single-family capital. AMH, which had been leaning into bulk third-party acquisitions for years, has not announced a comparable in-house build-to-rent platform; its growth runway under the new regime is narrower.

The same ROAD Act that restricts institutional SFR acquisitions creates the carve-out for new-construction rentals. That tilts BTR capital toward homebuilders that can deliver purpose-built inventory at scale. D.R. Horton — the largest U.S. homebuilder by volume — reported Q3 FY2026 (Jun30, 2026 quarter-end) revenue of $9.23 billion and net income of $905 million on a 22.6% gross margin. Lennar, the second-largest, posted Q3 FY2026 revenue of $8.05 billion and net income of $284 million. PulteGroup reported Q2 FY2026 revenue of $3.98 billion and net income of $472 million, a 20.7% gross margin. All three operate build-to-rent joint ventures or in-house platforms; all three now sit on the demand side of the institutional-exodus trade.

The affordability mechanism is more direct than the institutional-SFR leg. With the 30-year fixed mortgage rate at 7.09% in mid-September 2026, per Fortune's weekly tracker, monthly payments on existing inventory are stretched beyond most first-time buyer budgets. Builders can offer rate buy-downs through captive mortgage subsidiaries — a tool existing invokers cannot match — and that gap is widening. NAR reported existing-home sales fell 4.2% in the first half of 2026 while new-home sales gained share, and J.P. Morgan Global Research projected2026 existing-home prices flat and 2027 prices up 3%. Builders, not resellers, are the price-setters this cycle.

The mortgage-REIT cohort and the BDC cohort are collateral players in the political story, not the targets. AGNC Investment — a mortgage REIT with $75B+ in agency MBS — booked $610 million in Q2 FY2026 net income (largely unrealized gains on swaps hedging a long-MBS book), reflecting rate volatility more than any political event. Annaly Capital booked $822 million Q2 net income on a similar carry-trade profile. Two Harbors and Starwood Property Trust round out the public commercial-mortgage-REIT complex. None of these names owns enough single-family rental inventory to fall foul of the 350-home threshold; they are affected through the mortgage-rate channel.

Blackstone Mortgage Trust is the exception worth flagging. BXMT entered the single-family builder finance market in 2025 and publicly sized the opportunity at roughly $200 billion — a strategic pivot explicitly designed to capture institutional BTR and builder finance demand as regional banks pull back. Q2 FY2026 was ugly on a reported basis ($380 million revenue but a $0.48 net loss per share, driven by CECL provisions and mark-to-market), but the strategic direction calls for BKMT to become a primary credit supplier to the homebuilders that win the ROAD-Act-driven demand shift. On the BDC side, Ares Capital — the largest BDC at $26B+ AUM — reported Q2 FY2026 net income of $171 million ($0.24 EPS) and is a known backer of homebuilder financing; Blue Owl Capital's BDC [OBDC] and Golub Capital round out the relevant lender universe.

Short-term (days to quarters): The midterm election on November 3 is the proximate catalyst. More than two dozen candidates with explicit PE-curb language on the ballot means rhetoric-driven volatility for INVH and AMH around the result, even though the ROAD Act's 350-home rule is already federal law. State-level investor-targeted bills in Michigan, Georgia, and other Sun Belt states are a parallel risk. Build-to-rent construction starts are already down 26% year over year — 62,000 trailing-four-quarter starts versus 84,000 in the prior cycle — meaning the carve-out-driven recovery is the second-derivative trade for builders, not the first.

Long-term (one to three years): The structural read separates winners and losers cleanly. Builders (DHI, LEN, PHM, KB Home, Toll Brothers, NVR, Meritage Homes) capture diverted demand and rate-buy-down share. Build-to-rent capital follows the carve-out toward institutional platforms with vertical integration — INVH's ResiBuilt acquisition, Blackstone's Tricon Winchester community, Progress Residential's BTR pipeline. Mortgage REITs (AGNC, NLY, Two Harbors) ride the rate curve more than the political one. The clearest single long-term risk is regulatory drift: if ROAD Act enforcement tightens, if state-level restrictions multiply, or if the carve-out's seven-year resale-to-owner provision is enforced aggressively, INVH and AMH's organic growth rate compresses further and the builder-bid grows louder.