Which NOI lever belongs in the base case across a large mobile home park portfolio

Consider a hypothetical aggregation of 12 parks, roughly 1,050 pads, mostly 1970s builds in secondary midwest and southeast markets, master metered water, expense ratio around 44 percent on the seller's trailing numbers. Pitch decks in this space tend to stack four levers and count all of them in the underwriting, which overstates what the base case should carry. Lot rent to market is the most visible lever. If in place rent is $340 against comparable parks at $415, that is $75 a pad, roughly $945,000 a year across the portfolio, with almost no capital required. It is also the lever most likely to draw press attention and a city council hearing, since moving 1,050 households toward market in a single year is a real collections and reputation event. Phasing the increase over several years is the more common approach among disciplined operators. Utilities and water loss sit second. Master metered parks routinely run 20 to 30 percent unaccounted water, and submetering paired with a repair program on the worst laterals recaptures expense rather than raising rent, which tends to land better with residents. The capital requirement is real, and the billing method and any pass through service fee is regulated in a number of states, so that needs jurisdiction by jurisdiction review before it goes in a model. Pad fill is close to pure margin since the infrastructure is already paid for, but landing and setting a new home is a large check per pad and puts the operator into the home sales business, with financing, repossession, and inventory risk on the balance sheet. Expense professionalization, insurance rebid, tax appeals, payroll consolidation across a region, is the least glamorous lever and the most controllable one. These levers work against each other more than pitch decks admit. Pushing rent hard strains delinquency and turnover assumptions, which slows pad fill absorption. Running the water program first spends capital before collections are proven. The disciplined approach is to underwrite expense professionalization and a measured first tranche of rent to market as the base case, and treat water loss recapture and pad fill as upside that does not set the price paid for the portfolio.