This awesome mural can be found at the corner of Canal and Greene Street, in New York City:
The wall has a history of featuring GTA IV artwork. We took this photograph of it back in February, shortly before The Lost and Damned was released, and in 2007/08 it contained various logos and designs advertising GTA IV.
Link: Rockstar News Wire
Related Link: GTA IV Mural @ Canal and Greene Street - Google Street View.