If you reside in the UAE, you'll be required to furnish the Title Deed of the property, along with your passport or Emirates ID, and a duly signed Form A provided by your agent. This form delineates the property particulars, sales price, commission, service charges, etc. Non-residents can simply submit a copy of their passport for identification purposes.
In instances involving a Power of Attorney (POA), whereby a designated individual is authorized to sign on behalf of the owner, you will need the official POA document along with their passport copy, Emirates ID, and visa.
For properties registered under a company's name, you'll need to provide the company's Trade License along with the signatory's documents, including passport, Emirates ID, and visa.