That's interesting, what kinda system is it that powers the radiant heating?
There's a company called Legalett, that circulates warm air in the concrete, with a fan in a electric unit or a water heater.. It's pretty cool, and also really cheap.
I'd probably just put in some really nice shelves in there and maybe some music and a fridge
2000 Audi A8 SWB Silver/Black
1992 BMW 525iT/5 White/Blue [MPars, HIDs, cargo net]
1989 525i [scrapped]
1995 BMW 318i DASC [sold]