The issue and main cost was the sprinkler system.

I'm paying well over 70k/year vs hiring someone would cost much less. 

To start off, I am not new to the game, my father was an experienced flipper and he figured out how to BRRR himself before YouTube was really a thing.

@Annwar Zahrieh There are certain transactional costs/ costs of doing business in Philadelphia to be mindful of, but I believe the fundamentals that exist in Philadelphia far outweigh this IF investing wisely.

Will a DSCR lender give me a home equity loan from my (1st SFH) rental property, so that I can cover the down payment + closing costs to assume the 2.75% interest rate on a (3rd SFH) property I would move into immediately?

Decide which game you want to play.

and want people who are responsive and have the time/patience to interact with you.Also, search YouTube for what title companies do, how they doe it, and what are the costs in your state and locale.  

It costs about $300-400 depending on where you live and it saves a lot of problems. 

Just as you don't want to move as your friends are there, he may not want to move for the same reasons.If there are 5 of you going in on this (well 4 if you and your wife are combining your money for 25% of the costs), you need to talk to a lawyer about the 'what ifs'.  

He is facing a big repairing cost right now.My questions is can I ask all my applicants to disclose if they have pets including service pets when they apply?