The financing advantage is the whole game
A property of two to four units that you occupy is financed as a residence, not as an investment. That means a lower down payment, a better rate, and underwriting that will often count a portion of the projected rent toward your qualifying income.
The same building bought as a pure investment requires substantially more capital and costs more to borrow against. This gap is the single largest advantage available to a first-time buyer in Greater Boston, and it is available exactly once per property you are willing to live in.
Running the numbers honestly
Start with realistic rents, not optimistic ones, what comparable units in that specific neighborhood have actually let for in the last few months, not asking prices.
Then subtract everything: mortgage, taxes, insurance, water and sewer, common-area utilities, maintenance, and a genuine vacancy allowance. Add a capital reserve for the roof, the heating systems, and the exterior. On a hundred-year-old triple-decker this is not optional.
What remains is your true housing cost. On a well-bought two-family in Quincy or Dorchester it is frequently less than half of what the equivalent rent would be, and occasionally it is nothing at all.
- Use achieved rents, not asking rents
- Include water, sewer, and common-area utilities
- Allow for vacancy, one month a year is a reasonable starting assumption
- Reserve for roof, heat, and exterior separately from routine maintenance
Where the stock actually is
Dorchester has the deepest supply of two and three family buildings in the city, and the widest variation in quality and price. Quincy offers similar stock with more space and Red Line access. East Boston, Everett, and Revere all have real inventory and have not fully repriced.
The triple-decker is a genuinely good building type for this strategy: three units, separate entrances, straightforward layouts. Their weakness is age: most were built between 1890 and 1930 and many have deferred maintenance measured in decades.
You are becoming a landlord, and it is a job
You will get calls. Something will fail at an inconvenient hour. You will occasionally have to have an uncomfortable conversation with someone who lives ten feet away from you, and the fact that you share a wall makes it harder, not easier.
Massachusetts is a tenant-protective jurisdiction and the rules around security deposits in particular are strict, with real penalties for getting them wrong. Learn them before you take your first deposit, or use a manager who has.
The exit is what makes it compound
After a year or more of occupancy you can generally move out, let the unit you were living in, and repeat the process on another building, again with owner-occupant financing on the new one.
Done two or three times over a decade, this is how a number of people in this region built substantial portfolios on ordinary incomes. It is slow, it is unglamorous, and it works.
