Look into the BRRRR (Buy Rehab Rent Refinance Repeat) strategy.

Neighbors activity or their poor unit maintenance affecting your unit or tenants.

Will getting this second home loan right now, affect me negatively when I go apply for the construction loan in the next 1-6 months?

It will be interesting to see how lead based laws will be integrated and how it will actually affect things.  

That'll affect your pre approval and ability to buy. 

You’d need a professional inspection or sewer scope to confirm if the sewer line is affected.

Also you mention he has an awful reputation yet you acknowledged in your initial post you repeatedly buy properties his brokerage represents...not quite adding up.

I like the idea of being involved with and affecting the world. 

You can get into a home for little or even nothing down, perhaps add some value by renovation, then hop to a new primary residence in a year with little or nothing down, and repeat.

The good news is that these properties can indeed be purchased for various investment strategies, including rentals, BRRRR (Buy, Rehab, Rent, Refinance Repeat), or fix-and-flip projects.Purchasing as a Rental or for BRRRR:You can acquire a Freddie Mac home to hold as a rental property or implement the BRRRR strategy.