Philly RSA-3 Mixed-Use / Possible Triplex Conversion — Looking for Zoning Experience

[Charles Lundquist]

Hey everyone,

I’m looking at a property in Philadelphia and wanted to see if anyone has dealt with a similar zoning/use situation.

The property is currently zoned RSA-3. The city/property description says something like “Row mixed commercial/residential — built as residential.”

Historically, the building appears to have been used as a commercial space on the first floor with residential above. I also found old L&I/use-registration paperwork from the 1960s that seems to support a prior cleaning/pressing commercial use with a dwelling unit.

The physical layout/framing appears to support:

• commercial space on the first floor
• two small residential units above

The plan would ideally be to legally restore/convert it into either:

1. commercial space + two residential units, or
2. possibly three residential units

I understand RSA-3 is generally single-family by-right, so I’m trying to figure out whether this would likely be treated as:

• restoring a prior legal nonconforming mixed-use
• a use-registration issue
• a variance/ZBA issue
• or something L&I would likely reject without clear proof of prior legal multifamily use

I’m already speaking with a lawyer/permit professional, but I’d love to hear from anyone who has personally dealt with Philly zoning on similar properties.

Main questions:

Has anyone successfully restored a mixed-use or multi-unit setup in an RSA-3 property based on historical use records?

How much weight does L&I/ZBA usually give to old use-registration permits or historical commercial use?

If the old record shows commercial + one dwelling, but the building appears framed for two apartments above, is there any realistic path to legalizing commercial + two units?

How long did the process take, and what were the biggest surprises?

Would you treat this as a manageable zoning issue or a major red flag?

Any insight from Philly investors, zoning attorneys, expediters, or people who have gone through ZBA would be really helpful. Thanks.