Is it permissible to dispose of an apartment that was agreed upon with a Christian superior to be reserved in the employee's name and for which a down payment was made, and then the employee became in urgent need of it?

If the questioner waives his right to purchase the apartment for his manager, there is no objection if the company's regulations permit it. Otherwise, it is not permissible, based on the hadith (definition): "Muslims are bound by their conditions." The terms of a valid contract must be adhered to. If the waiver is permissible and the questioner purchased the apartment for the manager as an agent, and the sale was completed, then the apartment belongs to the manager. However, if the purchase has not yet been made and the questioner retracts his promise to waive, he is permitted to do so, and it is not considered a blameworthy breach of promise. This is because a blameworthy breach of promise occurs when a person makes a promise intending to break it, not when circumstances arise that prevent its fulfillment.