there is no bank, no mortgage, and therefore no due on sale clause.if there is a mortgage in place, and you take the payments over, this is typically referred to as subject-to or sub2 and is much higher risk for everyone involved.

It is the place to get the advise you are looking for

But the moment you say "well that sounds awesome, can you get that over to me in writing" it instantly turns into uhm's ah's and but's. 

Tenants prefer detached housing over attached housing and stay longer. 

That limit has bounced all over the place for the last 50 years and is subject to congress' whims. 

If you allow this to continue, they will only get worse over time, and your losses will increase.I suggest you hire an attorney.

I had just mastered the original deal analysis and was getting comfortable analyzing deals.  

Depends on the actual deal I have seen 85/15 rarely 90/10 but keep in mind your primary home will have a second lien on it typically if your LTV is over 75%. 

Be sure that you are honest from the jump, your estimated rate are only as good as the info you give them.

Since you want to aggressively invest in the near future, you will need cash and the 30 year option is the right one for you.