The last place I lived, the nearest data centre was a few hundred meters from the local swimming pool, in a business park. Most people would never have known the data centre was there.

Elsewhere, e.g. in London, Docklands is both full of high density data centres and high-end residential buildings and offices that could certain use the waste heat in winter at least.

Most of the data centres there just looks like office buildings on the outside, and most residents won't know they are there.