Hence the lot on which the house resided was taxed at a 45% discount based on actual value, while the tennis lot was taxed at about 4 times what it should have been by value. 

Also be aware of Unrelated Business Income Tax (or UBIT) on leveraged real estate inside of an IRA.Or better yet, since you are self-employed - go with a truly self-directed Solo 401k plan, which would be a much better option and will help you avoid the UBIT on this investment.

Looking for various tax strategies to reduce the reality that a large RV or boat is a grossly depreciating assetI would not have a loan, so claiming it as a primary or secondary residence and claiming the mortgage deduction is not applicable.I sold my primary residence and I have several rental properties which I use as I'm fixing them up.What I'm pondering is living aboard and working aboard developing a new product, while traveling.  

They lowered the “taxable value” by 40-50% and then raised the tax rate about 35-45% lowering everyone’s taxes that year.

Quote from @Joshua Tucker: What specific tax benefits can high net worth individuals receive from building real estate on tribal land?

if it is unsecured loan that is the consequence, you lose they entire thing. as far as tax write off, sorry but none.

This is tax free. 

Fannie/Freddie (Conventional) loans aren't just about rate and transfer taxes. 

In that case you might save taxes building with them.

The only taxes I remit directly now are the tiny town tax they implemented of 1%.I just take my net income spreadsheet and calculate the 1% and give them a check.