If you will receive less than what you would had it been sold at a higher value, you can protest the sale with the courts. The PR may also cause themselves to be liable to the heirs for the loss if they continue with the action.
along with that, the actions of the PR may not be improper if the circumstances allow or even urge it be done as it is being done.
as to maintaining the property; is there cash available to maintain the property? If not, who is going to front the costs of maintaining the building? Would you be willing to pony up the cash?