Based on my market knowledge, 350k for a new constructions with close to 3k in rent seems like a fairly solid deal for the area.

The best first step you can take is to connect to a great broker with market knowledge and existing deal flow.

I intend to buy them 10-30% below market value through my LLC. 

If you bought down the rate it would take longer for the market to improve enough to make refinancing worth it for you. 

A local lender came to my market center in the last year and talked about this....is there a box you can check when filling out an application that can let you "opt out" of the credit bureaus selling your information?

Since you have a background in software engineering maybe this could be a gap in the market you could fill. 

They have been on the market for over 150 days each and he cannot sell them. 

If he/she wants to be active, they you have short term, mid-term, and long-term rentals in addition to fix and flips, wholesaling, etc...

Market Research: Study the local market trends, job growth, and property appreciation to ensure long-term profitability.

Good or bad for the City of Philadelphia and more specifically the real estate market?