We would house-hack and use one of the units as our home base (since during travel therapy you have to have a permanent residence to return to for tax purposes) and rent out the remaining units to pay for the other expenses.

Once the home has a C of O, we rent to own them at $725.00 per month ($340 goes to lot rent and the remaining $380 is their home payment).

Is you wife clearly the heir.. is there a will, does your wife have a copy,,Or... what if one parent dies and then poof the remaining one gets remarried,,, what happens then..  

Unfortunately for them they remained stagnant.   

Installed a $100,000 dock a couple years ago with all the proper permits Zestimate has not changed in 3 years by more than a couple percent Anyway to let Zillow know in hopes they will increase the zestimate Remains the same as a neighboring house with no dock. 

if it is aggressive then it will remain so. 

Like to know if I should buy another investment property or pay off the 2 remaining and my home.

Once you increase your budget, go back and remain to the ones you already touched once.

However, if you can find the owner of record, and bargain with the owner to sign over his/her remaining interest in the property to you via a quit claim deed, then you would greatly increase your position in the property against HSBC while also eliminating the need to adversely possess the property. 

for the remaining 465 floors I had considered the following:Wood, oak, first class, natural type.