Have to factor in how much they're getting you for property taxes in the meantime, and the opportunity cost of sinking in the cash. Young investors should probably first make sure the credit cards are paid off, and even consider an extra mortgage payment, especially now that most take the standard deduction on federal income taxes, thus negating mortgage interest / salt deduction. I mean if you have time and the ability to do a lot of building yourself, then it may be a different story. Or if you can pay to build right away and can be a landlord, or have someone you really trust nearby, to get cash flowing quickly. Even then landlording/airbnb'ing a single residential unit not right nearby is rarely profitable IMO, esp in MA where laws are totally stacked for the tenant.