Rookery
Rookery , noun
1.
The breeding place of a colony of rooks; also, the birds themselves. — Tennyson
2.
A breeding place of other gregarious birds, as of herons, penguins, etc.
3.
The breeding ground of seals, esp. of the fur seals.
4.
A dilapidated building with many rooms and occupants; a cluster of dilapidated or mean buildings.
5.
A brothel. [Low]