A guy who is on the board of the Oakland Museum of California buys an abandoned 36,000 square foot warehouse (1350 Fourth St., Berk.) He doesn't realize the structure is a hot spot for local graffheads, but when he sees the art inside his new purchase he decides to roll with it, at least until he turns it into office space. Enter Endless Canvas , the superlative Bay street art site that Mr. Property Owner taps to curate the building. And viola. Special Delivery , a three-story aerosol wonderland, opened this Saturday with a bigass all-ages party, live music from Ear Peace Records , and what might be the highest concentration of legal street art you can see today in the Bay. The whole deal's only standing til the end of the month, so we suggest checking EC's website for its next viewing hours.