Build-to-Rent (BTR) Feasibility Study

Build-to-rent is a purpose-built rental community of single-family detached homes, duplexes or townhomes, delivered in phases, leased and managed from one office, held on one parcel or on subdivided lots under common ownership, and financed as a multifamily asset. It took the larger-household renter the apartment market has been losing: on the licensed national data MMCG carries, three-bedroom apartments carried the highest vacancy of any unit type in 2026 at roughly 9.3 percent, against 7.8 to 8.0 percent for smaller units, while Yardi Matrix's June 2026 report put national build-to-rent occupancy at 94.7 percent and the average advertised build-to-rent rent at $2,234, about 24 percent above the national apartment asking rent of $1,801.

Lenders ask for a study because the product has no settled underwriting template. The construction lender has a horizontal site plan, a per-home cost and a phased delivery it cannot test against an apartment comparable set. The takeout lender has a stabilization test written for one building. The equity has an exit that depends on who may buy single-family homes in 2027 and after. A build-to-rent study answers each of those in the lender's terms, and it is the same document the multifamily feasibility study page describes, with four sections that differ. Rural rental communities financed under Section 538 are covered on the USDA multifamily feasibility study page, and income-restricted communities on the affordable housing feasibility study page.

The 21st Century ROAD to Housing Act became law on July 11, 2026 (Public Law 119-101). From January 7, 2027, a for-profit entity with investment control of 350 or more single-family homes may not buy more, on pain of a civil penalty of up to the greater of $1 million or three times the purchase price, for fifteen years from that date. A single-family home is a structure, other than a manufactured home, with two or fewer dwelling units. The Act excepts purchases made under a build-to-rent program, in which the investor purchases, constructs, or constructs and retains newly built homes to be managed as rentals in all-rental or mixed communities, and it carries no requirement to sell those homes to individuals; the seven-year disposition rule in the Senate's March 2026 draft did not survive. Qualifying 55 and over communities, renovate-to-rent purchases, investor-to-investor transfers and several other categories are also excepted, and covered investors must report their holdings to HUD.

Two consequences follow for the study. First, product mix is now a regulatory variable: detached homes and duplexes are single-family homes that rely on the build-to-rent exception, while a building of three or more attached townhomes is not a single-family home at all, regardless of platting, and a community built from such buildings sits outside the cap entirely. Second, the exit is a sale to another institutional holder, which the Act permits, or a long hold; a study that models a retail sale of homes to individual buyers as the base case is modeling a liquidation, not a disposition. MMCG runs the exit at the institutional cap rate and runs the mix both ways.

The study builds demand from the renter households the product serves, which are households with children and households of three or more, in the income band the rent requires at a 30 percent rent-to-income ratio. For a $2,100 three-bedroom home that band begins at $84,000. The American Community Survey's tenure-by-income and household-size tables supply the count by county and tract, the price-to-rent relationship supplies the upper bound at which the household buys instead, and the study adds net new renter households from employer announcements measured by permanent headcount.

The rent premium is evidenced, not assumed. In the Greenville-Spartanburg market the published rents at the purpose-built communities delivered in 2023 and 2024 cluster at roughly $1,700 to $2,100 for three-bedroom homes and $2,100 to $2,500 for four-bedroom homes before concessions, against a metro apartment asking rent of $1,427 on the licensed data, and the newest communities are advertising six to ten weeks free. The study states each competitor's rent by bedroom from the community's own leasing page where it publishes one, marks aggregator figures as not verified, and carries the concession through its own lease-up. Where the market has no purpose-built competitor, the study uses the three- and four-bedroom single-family rental rents from the public rent indices and the newest apartment communities' three-bedroom rents as the two bounds.

Horizontal communities run three to five homes per gross acre for detached product and higher for attached townhomes, so a 120 to 180 home community needs 30 to 50 acres and a site plan that carries the roads, utilities, stormwater and open space the county's land development ordinance requires. The study reads the ordinance, not the listing: whether the jurisdiction permits a single-parcel rental community of detached homes by right, or allows only one or two dwellings per parcel and routes the community through planned development or multifamily review; what density class and open space ratio apply; whether the roads will be public or private and who maintains them; and whether the site lies inside a town whose code requires every one- and two-family structure to sit on its own lot, which forces the project toward a multifamily district or a flexible review district. Spartanburg County, South Carolina, for example, allows two detached dwellings on a parcel as of right and routes anything larger through development review under its unified land management ordinance, and the Town of Lyman's code requires each one- and two-family structure to occupy its own lot of record.

Utilities decide the site more often than zoning does. A horizontal community cannot be served on septic, and the sewer availability letter, the capacity fee per home and the line extension are conditions precedent in every study; Lyman charges a $3,000 residential tap and $10 per gallon of capacity outside the town against $1,500 and $5 inside it, which is a $3,000 to $6,000 difference per home at a 300-gallon design flow before any extension.

Per-home cost is built from the single-family cost base, not the apartment base. The National Association of Home Builders' 2024 construction cost survey put the average single-family construction cost at $162 per square foot, and Rider Levett Bucknall's first-quarter 2026 survey put single-family hard cost at $240 to $480 per square foot in Charlotte, the nearest covered metro to the Upstate, with the low end of that range the relevant figure for production rental product. The study prices the home at the production cost per square foot for its size, adds the site development cost per lot from the engineer's plan or the county's recent plat approvals, adds the utility fees per home from the published schedules, carries the land at the contract price per home, and escalates to the construction midpoint at the current index rate, which ran 4.45 percent in the year to the third quarter of 2026. Land is the variable with the widest range: the Lyman tract in MMCG's model study carries about $8,300 to $12,500 per home at 180 to 120 homes on a $1.5 million price, against a 2026 Phoenix West Valley build-to-rent land sale at about $410,000 an acre.

Four lines differ from an apartment budget and the study builds each from the local evidence. Property tax is assessed per home on a single-family basis in several states, and where rental housing carries a higher assessment ratio and full school millage the burden is a multiple of the owner-occupied tax on the same house: in unincorporated Spartanburg County a rental home assessed at 6 percent carries 319 to 376 mills, about $19 to $23 per $1,000 of market value, against about $4.73 for an owner-occupied home assessed at 4 percent and exempt from school operating millage. Landscaping and exterior maintenance run per home rather than per building. Turnover cost per home is higher because the unit is larger. Management fees for communities under 200 homes run above the 3 percent apartment convention, and the study carries 4 to 6 percent where the operator's fee schedule supports it. Insurance is quoted per home for the construction type. The replacement reserve is carried at the takeout lender's minimum per home.

Construction financing comes from banks and debt funds at the terms the market indicated in 2026: bank loans at about 55 to 65 percent of cost over SOFR plus 200 to 375 basis points with recourse or a completion guaranty, debt funds at higher leverage and spreads of 450 to 650 basis points. Because the community delivers in phases, the construction loan carries a phased draw and release schedule, and the interest reserve is sized to the phased lease-up rather than to a single opening.

Permanent financing runs through the multifamily channel. Fannie Mae and Freddie Mac ended their single-family rental pilot programs in 2018, so a stabilized community under common ownership is financed as a multifamily property, at up to 80 percent of value and 1.25x coverage on the conventional term sheets, once it meets the stabilization test, typically 90 percent occupancy for 90 days. Whether the community is held on a single parcel or on subdivided lots under one owner affects the collateral description and the appraisal, and the study states which structure the sponsor proposes and what the takeout lender will require of it. HUD 221(d)(4) is available where the project meets the program's definition of a multifamily project, and the study states the test rather than assuming eligibility. Published cap rates for build-to-rent remain thin; the study carries the institutional multifamily cap rate for the market, which on the licensed data was 5.6 percent for 4 and 5 Star product and 6.2 percent overall in October 2026, and stresses it by 50 and 100 basis points.

Build-to-rent communities lease in phases as homes are completed, which smooths the absorption but lengthens the period to full stabilization. MMCG's working range from recent lease-ups is 8 to 15 homes a month, with 10 to 18 months to 90 to 93 percent occupancy for a 120 to 180 home community, and the study replaces that range with the pace the named competitors achieved. Concessions are carried at the competitors' advertised level, which in the Upstate in 2026 ran six to ten weeks free, and burned off only as the market evidence supports; national build-to-rent occupancy fell 30 basis points in the year to June 2026, which is a signal that new supply is still being absorbed. The study runs a three- and six-month delay case and sizes the interest reserve and the operating deficit reserve from it.

Beyond the standard rent, occupancy, concession, expense, rate and cost stresses, a build-to-rent study runs three more. The product-mix case re-runs the project with attached buildings of three or more units in place of detached homes, which changes cost, rent, density and the federal definition at once. The tax case re-runs the budget at the full rental assessment with no exemption and at the owner-occupied comparison, so that the lender sees the spread. The exit case re-runs the sale at the institutional cap rate with and without the purchase restriction on the buyer pool, and reports the coverage and the equity return under each.

MMCG's model build-to-rent study, Build-to-Rent Townhomes in Spartanburg County, SC, tests a single-parcel rental community on a 38.33-acre tract on SC 357 near Lyman. The determination is not feasible as proposed at 150 mixed detached and attached homes at 65 percent loan-to-cost, where the community covers at 0.86x, and feasible as restructured at 180 attached three-bedroom townhomes in buildings of three or more units, with a $22,320,000 bank construction and mini-perm loan that carries the community to Year 3 stabilization and an agency take-out sized there to 1.25x.

An MMCG build-to-rent feasibility study runs 90 to 140 pages and includes the market area and demand analysis by household size and income, the purpose-built and apartment competitor census with the pipeline, the rent premium evidence, the land development review with ordinance sections cited, the utility availability and fee schedule, the per-home cost estimate, the operating budget with the per-home tax computation, the capital stack and phased draw, the lease-up and coverage schedule by year, the product-mix, tax and exit sensitivities and a signed determination. Standard delivery is 9 to 16 business days from engagement and receipt of the project file, with rush delivery available from 5 business days. Engagements start from $4,900, and build-to-rent studies are quoted on scope. Payment is 50 percent at engagement and 50 percent at delivery, and revisions required by the lender are made at no additional cost under MMCG's contractual acceptance commitment.