If you really want to get rid of them, sweeten the pot by offering to return their deposit after you verify the unit is empty with no damages. 

Quote from @Rick Im: Does anyone know of a lender that offers second mortgages on rental properties?

There are plenty of deals in Philly on and off-market from wholesalers, who are pretty decent in Philly compared to other places.You will need to get your GC license here and learn the permitting process and necessity here as well.

So I'm always able to offer a lower rates and fees and still make a decent living.

That said, it is a great place to invest and there are still plenty of good deals despite the national attention!

One long-shot option is to offer a lease at something like $1,300. 

He may realize the offer he had was inline with the value.

This community will offer you so much value - don't be afraid to drop your questions here or reach out to any of the folks above directly.

Depending on what the potential jobs offer in terms of income, does this seem like a realistic strategy?

Propose starting small, like a single-family rental or house hack, with a clear, low-risk plan to minimize concerns.Leverage your industry connections and offer to handle the initial responsibilities, demonstrating your commitment and capability.