The tower renter: what is yours, what is the building's, what is the landlord's
In an apartment, three parties share the electrical picture. The utility owns everything up to your meter. The building owns the risers, common-area wiring and the supply into your flat. Everything after your DB is the landlord's asset, and your tenancy contract decides who pays for repairs; the common UAE convention is that minor repairs below a threshold written into the contract fall to the tenant, while anything structural or aging-related is the landlord's problem. Read that clause before you spend anything, and photograph faults so the conversation stays factual.
Towers add a layer of process. Most managed buildings in Dubai Marina, JLT, Reem Island or Al Majaz require a work permit for any contractor entering the building, often restricted to weekday daytime hours, sometimes with a requirement that the company carries insurance. For a simple socket swap this is usually waved through at the security desk; for anything involving drilling or wall chasing, the building may want the landlord's no-objection letter first. Ask your building management what they need before the electrician is standing in the lobby.