Hi there, thanks for writing to us on AskGuru.
A condominium that is sold with tenancy means the unit will be occupied by a tenant under the Tenancy Agreement ends. This transfers the rights of the current landlord to the new owner until the end of the agreement.
You can refer to our Rental Tenancy Agreement guide here: https://www.propertyguru.com.sg/property-guides/understanding-lease-agreements-in-singapore-10363
Do note, an HDB flat cannot be sold with tenancy. In such a scenario, the landlord will have to compensate you for the unused lease term.
Hope this answers your question.