What type of asset is in short supply? 

I know I will need water, gas, and new electric ran to supply it.  

What is the supply / demand?

It's one thing to paint a house, it's another to paint a house while having to stop your car from being jacked and watching your supplies get stolen. 

mid-sized apartment building, you should be working with an experienced broker and/or attorney who should be able to advise you on what materials and {diligence} conditions should be identified in your APS.Building on what has been stated above, be sure to include the collection of estoppels from all tenants (and suppliers) and to have the clock on your diligence period start only once the Vendor has supplied the information requested of them (in the APS).Other items which we typically request as materials include: all leases and contracts; blueprints, engineering diagrams and assessments; existing environmental assessments; authorisation to pull the permit and work order / citation history on the property; finances for the past 3 years; current rent-roll along with economic vacancy (physical vacancy, concessions, evictions); list of recent CAPEx; statement of reserves (note: this should be included in the financials, but you never know).

Even if you found a GC that would , all they will do is bump up what they pay their subs , and when they buy materials at the supply house the invoice will be retail their discount will be on another ticket .  

@Kobi Walsh Put in your offer subject to a due diligence period to confirm all seller supplied information and to do any other due diligence required. 

Less hassle in the long run and you never have to worry about a tenant letting it run out and freezing your building.If you do end up keeping a separate furnace for each unit just be aware that propane tanks are typically supplied by the fuel provider.

When the demand is concentrated in the entry-level and median price ranges it stands to reason that the luxury market which has an over-supply would contract proportionately. 

I have a friend that owns a vending machine business and in a lot of cases the businesses don't get a cut of profits, but the businesses want the machine there so it will be there for customers, and the vending company supplies the machine, keeps it stocked, and maintained and keeps all the profits.