However, I am willing to move and make a commute to work each day in order to get started in real estate investing now.I would like to be able to get to grand central terminal within ~45-60 minutes, and would be looking to purchase a 2-4 unit (hopefully 4) multifamily where I could live in one unit.

An opportunity arose to make more money for less aggravation in the fresh air. 

Where there's an air/vapor/thermal barrier, that's the thermal envelope.

I sprayed and cleaned the windows, base boards, air intake vents....their instructions are very simple to follow.

Or you hire an environmental firm to do the job - they will seal the area while working and check air samples afterward, and they handle all disposal too.

And when I went to Coastal Carolina University, they were party central.  

David at Air Pro Tek Inc.

We also put a cup filled with vinegar in the cold air return and turned on the HVAC fan for a few days.

If people run their air conditioners all day, this isn't fair. 

If the seller says it needs about 50 that may cut it to get it rental ready but to hit comps close to or in the 4s I would imagine it needs much more, you need to factor in the basement (does it need dug or finished), do you need central AC added, Id imagine comps in the 4s have both of these things, also have a contractor check out the mechanics and overall structure, it can be hard for even a seasoned investor to come up with the right rental estimate.