Is anything from my wealth forbidden, or is there doubt regarding my sustenance, if I own a wedding hall and the tenants play music in it, despite stipulating to them that they are not to commit forbidden acts?

As long as you stipulate to the tenants that they are not to commit any forbidden acts in the halls you rent to them, and the contract is based on permissible use, then there is no blame upon you concerning the transaction and the earnings. The sin of any transgression lies with them, not with you. However, it is not permissible for you to rent out halls to anyone whom you predominantly believe will use them for something forbidden. As for someone about whom you do not know this, it is permissible to deal with him, provided the use is permissible, and you must forbid him if he transgresses.