@Ryan RobinsonNon-resident withholding is a means for a state to insure that it will receive its tax from investors who normally don't have a filing requirement within the state.PA's non-resident withholding requirement is one of the best since PA has a flat state tax rate.

The population is flat to slightly declining.

I live in an inflated real estate market and my thinking is that if my property value stays flat over 5 years, then I'd borrow that $30k for no interest for 5 years.

If you are looking for a 2 flat with 2 to 3 beds per unit your median price will be around 315K, depending on how much sweat equity you are looking to put in, 2 flats range from 200k up to 450K +plus.

I've decided a flat 8% is fair for what they do.6- how often do you visit your properties?

But of course, the rent is still totally flat for 15 years, so I'm not sure how to factor that in. 

If you end up needing an annoying number of comps run, you can either pay the agent a BPO fee, or flat monthly like @Andrew Postell recommended. 

I have an estate property in East Flat Bush which I am interviewing and hiring a real estate broker to list and sell for the estate attorney.The property needs updating.  

Also, I have a question, which is not clear to me at the moment, if somebody could help me out, would be great.So, it's clear that how to buy me first property (my focus will be on flats first).

Nothing against one man/woman operations but the reality is a single person performing property management flat doesn't have the resources to effectively manage many properties.