Because you received the property as a gift, the adjusted basis of the donor transferred to you and if this was rental property where depreciation was claimed, you may have to recapture some of the gain as ordinary income rather than capital-gain income.
The rules are complicated so I highly recommend you seek local professional assistance if you don't want to do the research yourself.
Read this thread on this topic : https://ttlc.intuit.com/community/investments-and-rental-properties/discussion/tax-on-giving-rental-...
