Power of attorney for real estate transaction
The answer will depend on the powers that were granted to you in the Power of Attorney. Most power of attorneys are broad and unrestricted in the powers granted to the agent. A General power of attorney may include the authority to sign legal contracts (such as a contract to purchase real estate) to sign promissory notes (such as in taking out a mortgage for real estate) and executing other legal documents on his behalf.
It is recommended that you review the specifics of his power of attorney to see what powers were actually granted.