The interest payments will be additional deductions/expenses. 

Everything verbal was to get me to sign there hidden intentions contract and to as time went - purposely break the contract allowing me to believe I could pick the availably showing times when in the “contract” said home has to be available. 

It would allow you to get some of that cash out, you could use that to invest, and it sounds like your existing cash flow could still cover everything.

For newly constructed, purchased or renovated properties and also retroactive generally over the last 10 years, building components are properly classified into individual units of property and accurate recovery periods for computing depreciation deductions.

Will section 8 allow bedroom in basement?

Presently they are only allowed if the owner lives full time at the same property.

Upon looking for a home to invest in, we noticed the seller only allows us to see the property if an offer is made.

As a buyer of the HOA it would be unlikely that the lender would release information to you that would allow you to do anything other than payoff the loan in full.

Currently have 4 rental properties and a good amount of equity which could allow me to break into larger real estate (multifamily, self storage, luxury str).

Examples include:- CAP's or limits on the number of vacation rental permits allowed.