Cops say the suspect approaches the victims from behind, pushes them to the ground, grabs their bag or necklace and flees.
The first incident happened on July 23 at 11:30 a.m. inside 2926 Wast 25th Street when the man stole an 84-year-old woman's bags. He later hit the same building about a month later on August 24 when he stole a 74-year-old woman's necklace.
The suspect then stole a 74-year-old woman's necklace inside of 2832 West 23rd Street on August 13 at 4 p.m. Four days later, on August 17, the man stole a chain from a 73-year-old woman's neck just down the street inside of 2946 West 23rd Street at 5 p.m.
The man hit the same building twice -- 2930 West 30th Street -- on August 21 at 5 p.m. and August 27 at 3 p.m. when a 70- and 75-year-old woman had their necklaces stolen.
The suspect is described as a black man in his 20s, about 5'9" to 6'0" tall and 140- to 165-pounds.
Anyone with any information is urged to call CrimeStoppers at (800) 577-TIPS. Tipsters can also submit information at www.nypdcrimestoppers.com or by texting CRIMES (274637) then entering TIP577.
All calls are confidential.