Ypsilanti, full of Satanists, or Good, Giving, and Game?

Redditor, ReverendSlick, noticed that a rooftop in downtown Ypsilanti appears to have the Number of the Beast on its roof. It's possible that the rooftop markings stand for "ggg" Dan Savage's acronym for good, giving, and game. Examination of the orthographic image below suggests it is the number 666 and aimed at the residents of the building across the street:

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Here is wisdom. Let him that hath understanding count the number of the beast: for it is the number of a man; and his number is Six hundred threescore and six.