Buying a Philadelphia duplex or triplex

Confirm the building and claim

Write down the number of long-term rental units being advertised. Keep it separate from the number you find in a City record. A listing that says “triplex” supplies a claim to investigate, not the document that resolves it.

Match the street address and nine-digit OPA account before comparing records. Check whether the listing covers one building, multiple buildings or a condominium. Our free checker covers one residential building advertised as two, three or four long-term rental units; other arrangements need a different investigation.

Save the relevant listing passage and the date you read it. You want a question that remains understandable if the listing changes.

Compare the records

Read each license and permit as its own record. Preserve the record number, count, status, issue date and expiration rather than copying a single number into your notes. OPA classification supplies context, not an explicit dwelling-unit count. Our source methodology explains the fields used by the check.

Then identify the approval documents relevant to the advertised use. The City lists changes in residential unit count among the situations requiring a zoning use permit. That does not tell you whether a particular building's history already supports its use. See the City's change-of-use guidance.

For a fictional example, a listing and license might show three units while an older permit describes two. Record the disagreement and ask what happened between those documents. Neither choosing the newest number nor taking a majority resolves the history.

Ask for the missing evidence

1. Name the exact count or use you need explained.
2. Ask for the relevant zoning approval, available occupancy certificate and associated plans or later approvals.
3. Compare their property identifiers, dates and actual passages with the original claim.
4. Take any unresolved scope or continuing-use question to L&I or a qualified professional before relying on it.

Also ask for the Property Sales Certification. The City describes it as reporting zoning classification, recorded use and uncorrected violations; it is a separate document to read, not a substitute for your entire investigation. Property Sales Certification guidance.

Use the worked seller requests to turn a discrepancy into a concrete question. Title, liens, building condition and other purchase risks remain separate work.

Not legal advice or a title, lien or physical-condition inspection. Confirm material questions with the responsible City department or a qualified professional. The free checker compares records within its stated scope.