Of course, tenant selection helps, they stagger the rents, the families who make twelve hundred a year pay more for the same apartment to help carry the families who make six hundred a year—you know, underdog milked to help somebody underdoggier—but still, the cost of the building and the upkeep must be as low as humanly possible.
There are no more uses of "upkeep" in the book.
Show samples from other sources
Just basic upkeep.
Gillian Flynn -- Gone Girl
"Courtesans go through the same experience: they’re taken in at a young age, and are bound to their brothels until they can earn back every coin that went into their training, upkeep, and wardrobe."