I would say if those are the true numbers, the place would have sold instantly already.Purchase of $179k and rehab of $150k to get a value of $735k is almost unheard of.Main red flag is that something else major is wrong with the property.  

At worst, an accessory to theft.

You should look at AirDNA for information about short term rental in the area.

Building on what's been said so far, STR is hard in Philly, and hard in general right now with the market and platform fees, etc.You owning the property and living in one of the units gives you both more flexibility and more oversight over the other 2 units to experiment.Assuming you've gone through the regulatory hurdles, you should rent one as a long-term rental. 

"I would need to get a cost segregation study done  in the first place" Need to get it done for what? 

Should the buyer or seller pay for the survey?

I started to notice some issues early on when I tried to get some new tenants screened and signed up. 

I recently went through an exercise where I examined each property in my portfolio to decide if my capital was positioned the way I wanted it to be and that had me consider selling this property.

The last point that I would make is you need to get into 3-4 pillars of the business that you will have for the long haul of real estate.

That might be an option.