The warrantless search of the loft reasonable

Bryan and Peter share a loft uptown. Bryan is a suspect in a string of robberies. An eyewitness provided a detailed description of Bryan, who has a criminal record for assault and battery. Police Officers were dispatched to the loft to investigate a noise complaint. The Police Officers asked if they could search the loft. Peter consented to the search. But Bryan, who was also present, refused. Police Officers left but staked a lookout, waiting for Bryan to leave. Bryan eventually left the loft in the middle of the night. Police Officers immediately put a tail on Bryan. Then the Police Officers returned to the loft and again asked Peter if they could search the place for a stolen stereo system. Peter, who was angry that Bryan was dating his ex-girlfriend, consented to the search. The Police Officers searched the loft, which was an open floor plan, and discovered stolen jewelry in the refrigerator. Bryan was arrested shortly thereafter.
a) Was the warrantless search of the loft reasonable under the Fourth Amendment?