The Fenix Lofts & Docks in Rotterdam’s Rijnhaven port district is a cool example of adaptive reuse. The base (or podium) is a warehouse that was built in 1922. It has a concrete structure. On top of it, a new 9 storey apartment building (also concrete) is supported using a steel table and frame that goes through the existing warehouse.
Here is a photo from inside the warehouse:
Parking is accommodated above grade within a portion of the existing warehouse. You don’t want to go underground here. This is certainly not the most cost effective way of building new housing, but it is a solution that could work in some situations. If any of you have a site or are looking at a site with an existing building worth preserving, this might be an option to consider.