Buying a property as primary, renting a bedroom or two to friends is a good way to start building your RE portfolio.

As eric pointed out, someone who lives in Phila will have to be registered as a manager of the property to obtain a rental license - usually a PMPersonally if you're looking to target SFH I would recommend: Roxborough (for 3+ bedroom - there is a large saturation for 1-2 bed apartments in area), East falls, E and W Mount airy (need to be proficient in neighborhood to know where the good and not so good blocks are, and far NE philly.

We needed to build more there but the cost to build has doubled and the return is t sufficient.

DSCR loans are not that low and regular hard money loans will be in the double digits.

What is unit mix of 1/2/3 bedrooms? 

At some point long past a previous owner had converted a bedroom to a bathroom in this apartment.

Build sleeping pods that are mostly soundproof (double walled construction) and ventilated. 

Hey Jay, Sorry...you are making me double-check my paperwork which is good...thank you.  

An ADU could rent for an additional $1,200–$2,000/month, depending on the local market, potentially doubling the property's cash flow.

@Felicia JenkinsAlso, Padsplit will want you to eliminate any dining room, den, etc to add more bedrooms.