A man scrawled the Star of David and “Jew?” onto the front door of a Manhattan apartment building, one of the latest outrageous acts of antisemitism to scourge the city, police said Thursday.

The bigot approached the upscale building on Fifth Ave. near E. 20th St. in the Flatiron District around 8 p.m. Nov. 9, cops said.

After vandalizing the building, he took off on foot.

The NYPD’s Hate Crimes Task Force is investigating the incident. Anyone with information is asked to call Crime Stoppers at (800) 577-TIPS.

Hate crimes across the city have exploded since Hamas attacked Israel on Oct. 7, prompting a strong military response.

In October, there were 101 incidents compared to 45 during the same month last year — a 124% uptick, according to police data.

Anti-Jewish incidents in particular soared, the data shows. Of the 101 incidents, 69 were antisemitic — 214% more than the 22 last October.