MHP Capex Underwriting: The $50-a-Site Reserve Gap

Published October 22, 2026

Freddie Mac's Optigo Manufactured Housing Community loan terms, as summarized in lender term sheets (Lument's July 2026 version among them), set a minimum replacement reserve of $50 per site per year, plus $250 per borrower-owned home where those homes are part of the collateral. On a 120-site mobile home park (MHP) of tenant-owned homes, that is $6,000 a year. An illustrative component schedule for the same park — asphalt, water mains, sewer collection, electrical pedestals, drainage — runs closer to $750,000 of eventual replacement cost, which annualizes to something in the range of $100,000. The reserve line is not wrong; it is answering a different question than the one an acquisition model needs answered. Figures here are illustrative and vary by park.

The cost side has not held still either. Per Bureau of Labor Statistics (BLS) Producer Price Index (PPI) data, the special index for construction materials stood roughly 10% above its year-earlier level in August 2026, a preliminary figure subject to revision. A Property Condition Assessment (PCA) cost estimate written against 2024 bid pricing is likely understating today's cost before anyone argues about scope.

Why MHP Capex Underwriting Starts With the Wrong Number

The reserve figures that circulate in MHP capex underwriting come from loan documents, and loan documents are written for a lender's purpose. Lender summaries of Freddie Mac's Optigo Manufactured Housing Community terms list the $50-per-site minimum, with a $250-per-home add-on only where borrower-owned homes are in the collateral. Lender term sheets summarizing the Fannie Mae Manufactured Housing Community product — Lument's published summary among them — describe a replacement reserve escrow as typically not required at all, while still requiring a PCA as a standard third-party report. Those two facts coexist comfortably: the escrow protects the servicer's ability to fund repairs during the loan, and on a tenant-owned-home park with sound infrastructure, the lender's exposure to pavement failure in year 11 is limited.

An acquisition model has a different exposure. The buyer owns the roads, the buried pipe, and the pedestals for as long as it owns the park, and the bill arrives whether or not an escrow was funded. Carrying $6,000 a year as the capital assumption on a 1970s-vintage park is not conservatism; it is an escrow convention standing in for an engineering estimate. Reserve requirements and escrow waivers differ by lender, by asset, and by sponsor, so the governing numbers are the ones in an actual quote rather than a term sheet summary.

What the Property Condition Assessment Actually Scopes

The PCA is the right document to build from, with one structural limit worth knowing. Per Fannie Mae's published frequently asked questions for PCA reports, all immediate repairs — life safety items, critical repair items, and deferred maintenance — must appear on the consultant's cost estimate schedule, and capital items requiring replacement during the mortgage loan term plus two years must be included in the replacement analysis. Fannie Mae also states that it does not specify a replacement reserve range, while noting that older properties without significant recent renovations warrant higher ongoing reserves.

Read that scope against park infrastructure. A 10-year loan gives a 12-year analysis window. Asphalt with six years of remaining life sits inside it. A water distribution loop with 18 years of remaining life does not, and a sewer main with 25 years does not. Neither is a reporting failure — the consultant scoped what was asked — but a buyer who treats the replacement analysis as the park's full capital picture has adopted the loan term as the useful life of buried pipe. The mechanics underneath this sit in mobile home park underwriting, and the broader item list in the MHP due-diligence checklist.

A Worked Example: Pricing the Infrastructure Schedule on a 120-Site Park

Take a 120-site, direct-bill park with tenant-owned homes (TOH) at 95% physical occupancy and lot rent of $425 a month. Gross potential rent is roughly $612,000. Applying the 5% minimum economic vacancy assumption that lender summaries of the Fannie Mae Manufactured Housing Community product describe leaves about $581,000, and other income of roughly $19,000 brings effective gross income to about $600,000. Operating expenses at 38% of effective gross income — plausible for a direct-bill, TOH-heavy park — put Net Operating Income (NOI) near $372,000. At a 6.0% cap rate that is a $6.2M value. All inputs here are illustrative.

Now the component schedule, as a PCA plus a contractor walk might assemble it:

The annualized column is a sinking fund: what it would cost each year to have cash on hand when each component comes due. It lands near $103,000, or roughly $860 a site — more than 15 times the $50-per-site floor. The same schedule read for a five-year hold is a smaller and more actionable number: the pavement overlay at about $260,000 and perhaps half the pedestal program at about $75,000, or roughly $335,000 of capital inside the hold.

That $335,000 is the figure that changes the deal. Added to a $6.2M purchase price with roughly $160,000 of closing and financing cost, basis is about $6.7M, and yield on cost on the same $372,000 of NOI is approximately 5.6% rather than the 6.0% the cap rate advertises. Roughly 15 basis points of that gap is closing and financing cost; the capex alone takes yield on cost from about 5.85% (on a $6.36M basis before capex) to about 5.55%, a haircut of roughly 30 basis points. The line item people miss is not the pavement; it is that the pavement is paid out of equity on a schedule, which moves cash-on-cash in the years it lands, not just the entry yield.

Debt sizing compounds it. With the 10-year Treasury at 5.28% as of October 2, 2026 per the Federal Reserve H.15 release (5.13% as of October 21, per FRED — rates move daily), an agency fixed coupon in a 6.25% to 6.75% range on a 30-year amortization against a 1.25x minimum Debt Service Coverage Ratio (DSCR) sizes this park closer to $4.0M than to the 80% maximum Loan-to-Value (LTV) the term sheets permit — the coverage test binds first, as covered in MHP agency debt sized by DSCR. Required equity of roughly $2.4M including closing and financing cost, plus a $335,000 capital budget, is a materially different check than the headline.

Capex Belongs in Basis, Not in the Cap Rate

There are two defensible ways to carry the number, and one that quietly destroys the analysis. The approach that tends to hold up treats near-term replacement as capital: price the hold-period schedule into basis, fund it on a draw calendar, and test yield on cost against the entry cap rate. Genuinely recurring items — pavement crack-seal, pedestal repairs, tree work — stay as an annual reserve above the sinking fund, often well above $50 a site.

The approach that misleads is deducting the full $103,000 sinking fund from NOI and capitalizing what is left. On this park that produces an indicated value near $4.5M against a $6.2M ask, a gap of roughly $1.7M. The arithmetic is correct and the conclusion is not: capitalizing a one-time replacement treats it as perpetual, double-counts spend already reflected in the price a seller will accept, and ignores that some of the budget supports lot rent or infill rather than merely preserving the asset. Running both views is useful precisely because the spread between them shows how much of the price is riding on capital timing. For how this flows through to the sale, see MHP exit value and NOI.

Worth separating as well: park infrastructure is not home capex. Where the park owns homes, the per-home roof, floor, and turn costs are a distinct and larger load, analyzed in the park-owned home expense and capex reality. A park running its own water or septic system carries a third category again, with a regulatory tail covered in private water in MHPs.

Where This Thesis Breaks

A component schedule is only as good as its pricing. Remaining useful life from a PCA is an estimate from a walk, not a core sample. Pavement rated at five years can run nine with light traffic, or fail in two under a wet subgrade. A schedule built on published life tables rather than local bids can be wrong in either direction by a wide margin, and the roughly 10% 12-month increase in the BLS construction materials index is a national, preliminary index reading, not a quote.

Some parks genuinely do not need this. A 2015-vintage community on public water and sewer with concrete drives may have almost nothing in the window, and a sinking fund near the agency floor could be approximately right. Applying a deferred-maintenance framework to a park that has none manufactures a discount the market is not offering, and loses the deal to a buyer who read the asset correctly.

Sellers price condition too. A park with visibly failed pavement is usually not trading at a stabilized cap rate on broker NOI. Where the discount is already in the ask, adding the full capital schedule to basis double-counts, and the real question becomes whether the discount matches the bid rather than whether capex exists.

Capital that earns a return is not purely defensive. Pedestal upgrades that let a park accept larger homes, or a water line replacement that cuts a leak loss, may carry measurable yield. Treating the entire schedule as a drag understates those components, and a lot-by-lot yield-on-cost test is the more honest read of them.

Lender treatment can move faster than the model. Where a PCA identifies immediate repairs, a completion or repair escrow at closing reduces net proceeds regardless of what the acquisition model assumed, and an escrow waiver available in one quarter may not be in the next. Verify current escrow and reserve terms directly with the lender.

The Bottom Line

The $50-per-site reserve is a servicing floor, and the PCA replacement analysis is scoped to the loan term plus two years. Neither was built to answer what a buyer's roads and buried utilities cost over a hold, and on an older park the gap between the escrow convention and a component schedule can be more than 15 times. Building the schedule component by component, splitting it into what lands inside the hold and what does not, and carrying the near-term portion as basis rather than as a cap-rate deduction turns a $750,000 question into a known input. The resulting capex haircut to yield on cost — roughly 30 basis points, or about 45 with closing costs included — is a smaller number than the scary version and a far more defensible one. Figures throughout are illustrative and vary by park, vintage, and local bid pricing.

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This analysis reflects current market interpretations as of the publication date and may evolve as new data becomes available. Figures cited are drawn from public sources including lender term-sheet summaries of Freddie Mac's Optigo Manufactured Housing Community product (Lument, July 2026), Fannie Mae's published frequently asked questions for Property Condition Assessment reports and Multifamily Selling and Servicing Guide, a Lument term-sheet summary of the Fannie Mae Manufactured Housing Community product, Bureau of Labor Statistics Producer Price Index data for August 2026 (preliminary), and Federal Reserve H.15 selected interest rates via FRED (October 2 and October 21, 2026), and are subject to revision. Agency reserve, escrow, and third-party report requirements change — verify current terms directly with the lender. Nothing in this post is investment advice; readers should conduct their own diligence and consult qualified professionals before making investment decisions.