Freehold is inheritable and mortgageable, and since 2019 non-Muslims can register wills (DIFC or Dubai Courts) governing UAE assets. Whether a specific building is in a freehold zone is a registry fact, not a listing claim; it is worth verifying on anything unusual.
This explains the general case. If Freehold has come up in a live deal of yours, talk to the team: specific answers, registered numbers, no obligation.