No hangars...

Put together the numbers that show them it will be profitable, and present them to the airport management and any overseeing governmental committee (County Council, Airport Commission, etc.).  You'll have to examine construction costs, financing options, amortization and repayment, maintenance, etc., as well as obtaining commitments from potential tenants.  This won't be easy, but it's been done in the past..  The biggest problem is that the FAA won't fund taxiways to T-hangars, which adds significantly to the initial construction costs.  Another option is to contact a company which builds and rents hangars on contract to airports.  The company leases land from the airport, then builds hangars at their expense and collects rent from tenants.  One company which does that is Sky Harbor (http://skyharbourhangars.com/).  Another possibility is to be your own contractor, and put together a consortium of tenants to put up the money (or otherwise obtain external funding) for the project.  Most airports are happy to work with someone who will simply lease the and and take care of everything else themselves, but recognize that the contractor is taking on all the financial risk, which is why companies like Sky Harbour won't go ahead without serious commitments from potential tenants.
 

Thanks Ronald. Last I checked 2 years ago, the waiting list was 15 deep and hasn’t moved...  I know the commitments would come easy, I’m at KVBT I’ll check into that link and continue to gather info.

The commitments may come easy, but will they put their money where their commitment is?  That's usually the biggest problem.

Lack of hanger space is probably the single largest barrier to aircraft ownership in the United States unless you live in a mild enough climate to tie down outside and don't mind the toll that takes on paint and avionics.  Only the very affluent can afford to build or buy homes at private air parks.  Hanger lists often have hundreds of people in waiting and unfortunately some of these "lists" are really phantoms...it's more "who you know" and not where you are on a list.  Not to mention the near mortgage monthly costs for some.  Some airports automatically take ownership of privately funded hangers after a certain time period which makes no business sense for a potential buyer to invest in.  Some individuals with hanger space aren't even using them for airplanes, they're storing classic cars in them and I even saw a guy using his as wood working shop to build furniture.  It's a real mess.

That’s been my experience too...  That phantom list comment for sure. I was on the list for nearly two years. Then the field built new clubhouses and about 3 hangars shot up by private owners where money is no object. I figured maybe just maybe they’d move their planes out and I’d have a shot. We asked about the list and no one could even find it.

Michael Morgan:
Some individuals with hanger space aren't even using them for airplanes, they're storing classic cars in them and I even saw a guy using his as wood working shop to build furniture.