If there are no comps then you would have to rely on quotes you get from General Building Contractors to give you a cost per square foot to build at that location But without actually building plans designed and stamped by an architect and structural engineer you may not be able to get exact figures but a ball park figure at best.

I've had pretty good success charging my tenant's benefit cards (MasterCard stamped).  

Transfer taxes / stamp taxes are normally added to the cost basis of building / land.

You can lose spending power to inflation but you can lose your shirt elsewhere.

Does this trigger having to pay transfer taxes or doc stamp taxes in Florida (which are $$$)?

If you contact an online marketplace that stamps out LLC's they will provide a step by step to get one setup for very little money.   

The information below was provided by a Loan Officer for my Closing Cost as the Buyer/Borrower and Title Company for the Seller's Closing Cost.Loan Information$185,000 = Loan Amount$9,250 = Conventional Loan Down Payment (5%)$4,980 = Estimated Closing Cost: (Processing Fees, Underwriting Fees, Appraisal, Appraisal Review Fee, Title Insurance Services, Settlement Fee, Administrative Fee, Courier Fee, Owner's Title Insurance, Lender's Title Insurance, Recording Fees, City/County/Stamps, & State Tax/Stamps)$2,120 = Estimated Prepaid/ Estimated Reserve Cost: (Daily Interest, Home Insurance, & Property Taxes)$16,350 = Total Cash at Closing from Borrower$1,000 = Estimated Monthly Mortgage Payment: (P&I, Hazard & Mortgage Insurance, & Real Estate Taxes)Seller Closing Cost$0 = Agents Commissions: (No REA involved in this transaction per Seller's request)$900 = Total Cash at Closing from Seller: (Estimated Doc.

Appreciate any input I think you're making the worst mistake of your life, that you should probably learn a lot more before you even think about something like this, and that you are probably way out of your league with real estate and should stick to stamp collecting or seashell hunting.

Another thought is that you could lose your shirt if the GP fails in their venture or things go sour.

I am not familiar with your county requirements but a Professional Engineer (PE) will more than likely be required to stamp all drawings.