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.
There's plenty of free parking, free admission, giant pool with some small waterslides and stuff, a bunch of picnic tables and public barbecues, generally some nice greenery and trees for shade, ponds and fountains and stuff, a bandstand, etc.
It's not somewhere you'd pop over to for a "quick swim", but especially for lower income people it's a great place to have around as a "grab a pack of hotdogs and your swim trunks and make a day of it" sort of thing. As a kid we couldn't afford to, say, go to the actual waterslide park or anything so I have a lot of fond memories of visiting the steel plant.
I'm sure the construction and upkeep was less than a rounding error in terms of construction and upkeep costs for the plant itself.