The build quality of the structure does not matter when your septic fails or your well becomes contaminated. What does the overall owner do when he can't rent out a unit,two units? I hope no major repairs come. I own an apartment building and no matter how well you maintain it there are always repairs to do. Guess who pays? Not the tenants. What do you do when you get a bad renter and they stiff you for thousands of dollars in rent and then trash the place and leave you with thousands of dollars in repair bills? You're losing income because a unit is offline and your dumping money into repairs. It's not as great as it sounds.