The end of 5Pointz, a graffiti mecca, which was whited overnight.

Usually, it is the graffiti artists who work under the cover of darkness, hoping to evade police detection as they scrawl a tag on property that is not their own. But on Monday night, it was the owner of a building in Queens who used a crew of painters to work overnight and paint over graffiti on a warehouse in Long Island City, wiping clean a canvas that was used by thousands of artists over the years to transform an otherwise nondescript, abandoned brick building in a working-cl…