Now lets compare this to @Genny Li system with an install cost of, say $4,000. 

I would recommend talking with several LLC facilitators to compare pricing and service offerings to the companies you have mentioned.

Especially as an OOS investor, investing in comparable RE assets I need to account for these reserves and I don't buy turnkey or uninhabitable buildings so it's a middle of the road option that works for me and prevents me from getting bogged down in analysis paralysis.

Unfortunately the transfer tax in PA is quite high compared to other states.

Purchase price for a comparable is 1.5mil-1.9mil, one currently for sale actually.

Also, I am looking for the best ways to find comparables on sold multifamily apartments nearby.

I always encourage "kicking the tires" comparing options and "Apple to Apples". 

Compare that to the 3 flat I own where I have 250 equity in it and the tenants pay the mortgage and taxes and I net $2000 a month.

The capitals gains hit would be around $38,000 but I feel like that is the smaller number compared to reinvesting now via 1031 and paying these super inflated prices only to be in the hole later.I am contemplating selling and holding for a few years or possibly using the sale to pay of my primary homes mortgage which would save me $135,000 in interest.

Are they really in comparable shape to those that are renting for 925?