Philly RSA-5 zoning and permit use question

[Eric Yee]

Hi, I’m looking for advice from a Philadelphia Zoning Attorney. I’m looking to buy a 1,115 square foot Philadelphia row home that has already been converted into 3 studio units. It’s zoned RSA-5 as a residential single family with permit use as a single family. Can I get a change of use variance to make it a LEGAL multifamily or short term rental? Or will the city/L&I not allow it due to the square footage? I couldn’t find the minimum square footage needed per unit if it’s zoned RSA-5. Any help or advice is appreciated. Thanks!