A hundred-site manufactured housing community and a hundred-unit apartment complex can look almost identical on a rent roll. Same number of doors, similar total monthly collections, similar-looking P&L at a glance. But underneath, they're structurally different businesses — and the operators who bookkeep a mobile home park like it's just a cheaper apartment building are the ones who get blindsided at refinance, at sale, or the first time a state legislature decides to regulate how they bill for water.
Manufactured housing communities (MHCs) have quietly become one of the most sought-after asset classes in commercial real estate, prized for cap rates well above stabilized multifamily and for the fact that residents own their own homes, which caps the landlord's maintenance exposure. But that same ownership split — land owned by the operator, home owned by the resident — creates accounting complexity that a generic property management chart of accounts simply doesn't capture. Get the books wrong here, and you won't find out until a buyer's underwriting team does the finding for you.
Two Businesses Inside One Fence Line
The first thing to understand about MHC bookkeeping is that most communities are really running two separate businesses at once, and your chart of accounts needs to keep them apart.
Tenant-owned home (TOH) sites are the simpler side: the resident owns their manufactured home outright and pays you lot rent to lease the land underneath it, plus access to roads, utilities hookups, and common areas. Your obligations are mostly infrastructure and grounds — you're closer to a landlord of dirt than a landlord of buildings.
Park-owned home (POH) sites are a different animal entirely. You own both the land and the home, you collect a combined home-plus-lot rent, and you carry all the maintenance, appliance replacement, and turnover costs that come with owning a housing unit. A furnace failure, a roof leak, a full interior rehab between residents — all of it sits on your P&L, not the resident's.
If your books lump TOH and POH revenue and maintenance expense into the same accounts, you lose the ability to answer the two questions that matter most:
- What is my POH program actually costing me per unit, per month — and is it still worth running, or should I be converting POH units to TOH sales as they turn over?
- Is my rent growth coming from real operating improvement, or is it being masked by a good year of home sales?
That second point is where a lot of otherwise-careful operators get their numbers wrong.
Stop Booking Home Sale Proceeds as Revenue
When you sell a park-owned home to a resident — converting it to a TOH site in the process — the proceeds from that sale should not hit your operating revenue line. It's a capital transaction: you're disposing of an asset, not earning rent. If you book it as revenue, your net operating income looks inflated in any year with strong home sales and looks like it cratered the following year when sales slow down, even though nothing about your actual rent roll changed.
This matters enormously at refinance or sale, because MHCs are valued as a multiple of NOI, and buyers' underwriting teams will strip out non-recurring items whether or not your own books already do. If your reported NOI includes a lumpy year of home-sale gains, you're either going to get caught overstating value in due diligence, or — just as costly — you'll have failed to present a clean, defensible NOI trend that would have justified a better price. Structure your accounts so home sale proceeds and cost basis sit clearly below the operating line, tracked separately by unit if you can manage it.
The Utilities Line Item That Hides Your Real Cost Structure
The second common mistake is dumping water, sewer, gas, and electric into a single "utilities" expense account. It's convenient, and it's also nearly useless. When one utility spikes — a well pump failure, a sewer line break, a rate hike from the local co-op — a blended account buries the signal. You want gas, water, sewer, and electric broken out individually, and ideally trackable by community if you operate more than one park, so you can see exactly which utility and which site is driving the trend.
This granularity matters even more in 2026 because of what's happening with Ratio Utility Billing Systems (RUBS) — and this is the compliance risk most MHC operators are underestimating right now.
RUBS Is Under Direct Legislative Attack
For years, the standard way for park owners to recover utility costs on unmetered sites was RUBS: pay the master water, sewer, or electric bill, then divide it among residents by a formula — occupancy, square footage, or a flat per-site allocation. It's simple, and it's exactly the kind of formula-based billing that tenant advocacy groups and state legislators have started treating as ripe for overbilling abuse.
The regulatory response has moved fast:
- Minnesota banned RUBS for electricity outright as of January 1, 2025, and now mandates strict formulas for gas and water billing, with administrative markups on utility costs prohibited entirely.
- Colorado's HB 25-1090 only permits RUBS on existing properties under documented, fully transparent conditions — and requires individual meters for gas, electric, and water on any new construction after July 2027.
- Arizona's Attorney General issued a formal consumer alert warning that overbilling residents on utilities can trigger consumer fraud liability.
- California is facing active class-action litigation over RUBS practices, with Los Angeles considering an outright ban.
- Washington and New York both have pending legislative activity on the same issue.
The financial stakes are not abstract. A 100-site community billing $60 per site per month through RUBS is generating roughly $72,000 a year in recovered utility cost. If a state bans that billing method and you have to absorb the cost instead, that's not just $72,000 in lost annual income — at a 6% cap rate, that's over a million dollars in asset value gone in a single legislative session, whether or not you saw it coming.
If your community relies on RUBS, this is the year to model both paths in your books: what your NOI looks like with cost-recovery intact, and what it looks like if you have to absorb utility costs outright. The two realistic paths forward — submetering (roughly $800–$2,500 per site to convert, or $150,000–$250,000 for a 100-site park, typically paying back in 3–5 years through reduced waste and fewer billing disputes) or a third-party billing service ($3–$8 per site per month, which also shifts compliance liability to the vendor) — both need clean, per-utility accounting to evaluate properly. You can't run that comparison off a blended utilities account.
Lot Rent Rules Are a State-by-State Patchwork
Unlike apartment rent control, which is concentrated in a handful of expensive metro states, roughly 44 to 45 states place no cap at all on manufactured housing lot rent increases — you can raise to market with proper notice, full stop. But the exceptions matter, and they're getting more aggressive:
- New Jersey caps annual lot rent increases at 3.5% without state approval for a higher increase.
- Washington caps increases at 5% annually for tenant-owned homes on leased land, with no increases permitted at all in a resident's first year.
- California has no statewide cap, but roughly 100 cities layer on local Rent Stabilization Ordinances that function as a de facto cap within those jurisdictions.
If you operate across state lines, your books need to track which sites fall under which regime, because a rent-growth assumption that's perfectly legal in Texas can be a compliance violation — and a serious valuation risk — in a capped New Jersey or Washington market. Rent control directly compresses the multiple a buyer will pay, since value is a function of NOI growth potential, so this belongs in your underwriting model, not just your compliance checklist.
Infrastructure Is the Capex Risk Nobody Budgets For
The single biggest financial surprise for new MHC operators is usually infrastructure, not the homes themselves. Roads, water and sewer lines (or septic systems), drainage, and electrical distribution are typically the operator's responsibility across the entire community — and unlike a roof or an HVAC unit, these systems fail invisibly for years before a six-figure repair shows up all at once. A community that's been coasting on deferred infrastructure maintenance can look profitable on paper right up until a water main breaks under a road you now have to repave to access it.
Track infrastructure capex in its own account, separate from routine repairs, and build a reserve line into your projections even if you've never needed to draw on it. Buyers underwriting an acquisition will ask about the age and condition of underground utilities before they ask almost anything else, and "we don't have separate records for that" is not an answer that helps your price.
Building Books That Survive a Sale
The thread running through all of this is the same one that matters for any income-producing real estate: your chart of accounts should match the questions you'll eventually need to answer, not just the categories that were easiest to set up on day one. That means TOH and POH revenue and maintenance kept separate, utilities broken out by type and by site, home sale proceeds kept below the operating line, rent-control jurisdictions tracked explicitly, and infrastructure capex given its own account instead of hiding inside "repairs and maintenance."
Keep Your Ledger as Clear as Your Rent Roll
Whether you're running one community or a growing portfolio, the accounting decisions you make today determine how defensible your numbers are at your next refinance or sale. Beancount.io offers plain-text accounting that keeps every account, every utility line, and every TOH/POH split fully transparent and version-controlled — no black-box software hiding how a number was calculated. Get started for free and see why property operators are moving their books to a system they can actually audit.