Somprasong Sathipchan said his rented rooms have been hit by three underwear thefts during the past three months.
Footage of security camera showed a man walking and calmly choosing underwear from an assortment on clotheshangers outside the rented rooms.
"He did it like he was shopping in shopping mall, " Somprasong said.
He said the police failure to arrest the thief has scared many of his female tenants, causing them to stop renting his rooms.