Person who buys land or property, redevelops/refurbishes it and sells it on quickly for a profit. Often to the perceived determent of the local community.
A person buys an old stable block and paddock on the outskirts of a village, knocks it all down, applies for planning permission to build a huge house. If successful builds the house and quickly sells it.
"*Insert Persons Name* is just a house whore"
they are not contributing anthing to the local area, they are just here for a quick buck, they are just a house whore.