Or making sure plumbing is properly insulated or protected for cold winters, etc.

Historically, we are very well insulated from national market forces, although not immune.

Make sure to insulate them well!

Although there are companies who use lower standards (paneled walls, presswood floors, etc), the companies I have worked with in Florida use higher end materials like tongue and groove plywood floors, 100% drywall construction with 2x6 walls, spray foam wall insulation, granite counter tops, etc...and then we delivered them in 2 pieces via semi truck (or as many as 8 pieces depending on size and number of floors).

But also... sagging roof and some structure, hollow walls= no insulation or anything!

Was slab floor and blow in insulation above. 

Here are the specifics on the unit:Large Hangar For Sale $197,500 Hangar Size: 4,125 SF (55' x 75'), Construction: Steel hangar fully insulated with efficient natural gas heat.Lot Size: 0.19 Acre (8,125 SF) of leased landZoning: AIRPORT-L, M1-L,OSPR-L, PF-L23 years remaining on land lease.Hangar has an office, shower, gas heatSingle lift hydraulic 53' x 18' door200 amp service

Double hell if your garages faces south or west, even if the door is insulated (most homes down here are not). 

No matter how much new build there is, location will always insulate the older properties;  and fully rehabbed older properties are in fierce demand right now.  

The duplex has great insulated walls so we can't hear anything from the other side.