The crime happened Feb. 3 just before 3 p.m. at a building on Washington Place between 6th Avenue and Washington Square West.
Authorities say the suspect got into the building through an unlocked door, and once inside, took a box containing a $5,000 wedding dress from the lobby.
The victim said she is already married and was having her dress shipped to a different location at the time of the theft.
Anyone with information is asked to call the NYPD's Crime Stoppers Hotline at 1-800-577-TIPS (8477) or for Spanish, 1-888-57-PISTA (74782).
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