Here are some ideas we have researched on the web:- solar farm for flagler- cheap indoor or RV storage- lease land to farmer- harvesting timber- create a campground- horse stables- create property(ies), maybe a trailer park?

Many many millions of acres of timber has been harvested with nothing more than blaze lines. 

And there are a whole heck of a lot of multi generation Timber land owners that live off their Timber by harvesting select amounts annually or every 3 to 5 years  replanting and just managing the Timber. 

A property that will generate cash flow may stall or deflate when it comes to appreciation, and it could be a coup in a low-interest environment to harvest that equity at a high point and utilize those funds to expand your portfolio. 

@Eric BelgauI have some good contacts for tree harvesting if you are in need.

I often remind myself of that when pricing my properties.Here is a breakdown of my current flips and DOM:6113 Harvest Ln- list date 12/31/10 (bad timing)- under contract 3/6/11.

Either of these two ideas might give you the 15K sqFt in a smaller footprint (by building up) while also harvesting back parking.

It may be a stretch, not knowing all your numbers, but you may even be able to do a cash-out refinance that increases cash flow from this duplex and liquidates some of your equity to use on another investment.If it were my property, I would hesitate in selling just to harvest the equity.

If you do a good job you can harvest these investor relationships over the course of your investing career4.  

If rents go up 3% a year I'd bet maintenance and other expenses go up as well, I doubt you can get 3% net increases every year without the amenities grown being included, maintained, harvested and probably distributed.Another no interest deal?