Is it possible to find someone who specializes in both i.e attorney + CPA?

Little background on me - I'm a mortgage banker at Berkadia in Seattle specializing in conventional and small balance Freddie Mac and Fannie Mae mortgages - typically >$20M. 

Looking for a referral of an Attorney who is licensed in PA and specializes in Landlord Tenant law.

He specializes in real estate investing.

That's a special kind of crazy.If the numbers are accurate, it looks like an opportunity worth pursuing.

There are several that specialize in East Side apartments, you'll see their names on Zillow and Craigslist ads for the area but if you can't find them for some reason I can give you a couple to call.Usually in RI it's the landlord who pays the rental agent fee, so it shouldn't cost you much of anything (maybe the price of a credit check or small application fee) to use a rental agent, if you choose to do that.Good luck and if you have more specific questions feel free to post them here too :)

Bank 1 has offered us (through a special relationship with my employer) a rate of 3.875% for 30-year fixed mortgage, but only requires 10% down payment with no PMI requirement.Bank 2 has offered us a rate of 3.125% for 30-year fixed mortgage, but requires 20% down payment, and the 3.125% low rate is conditioned upon us putting $500k cash in a Bank 2 account (I think this $500k would include the down payment amount and isn't on top of/additional to the down payment, thankfully!).

I would prioritize finding an accountant who specializes in real estate taxation over one that is local.There are 20+ accountants on this message board who specialize in real estate taxation.

The realtor is a special skill set for helping real estate investors.

You certainly have the right idea - looking to build your team right out of the gate.There are a few of us here on BP who specialize in working with real estate investors and I believe most offer a free intro meeting (we do).Shop around a bit and see if there's a good fit for you.