flatdweller means one who lives in a flat.
Etymology
Compound of flat + dweller.
noun
- One who lives in a flat.“That inadvertently chucked a handful in the fan, all right; the foreman was summoned to the dispatch manager's office and there upbraided for squandering such an asset on mere flatdwellers. After all, he was forcefully reminded, it was the manager who dealt with the irate Greenside subscribers who invariably began their calls with: 'I would have you know that the managing director of your paper is”