Collocations for mansion - noun

big, great, huge, large
30-room, etc.
grand, stately
lavish, luxurious, luxury (esp. BrE), palatial
beautiful
country (esp. BrE)
old
stone
17th-century (esp. BrE), etc.
Elizabethan, Victorian, etc.
Beverly Hills, Hollywood, etc.
family
executive
The rebels besieged the heavily fortified executive mansion.

haunted

live in
have, own
buy
build
enter, leave

stand
The historic mansion stands in 160 acres of parkland.

house
block, flat (both BrE)