There's a building in the Bay Area that has furniture affixed to the
outside wall. Colorful chairs, some lamps, a chaise lounge, a TV. The
chair legs are perpendicular to the wall, so it looks like the
furniture is defying gravity. The building looks like your average
apartment residence, with white paint and a fire escape and some mural
art below. Is this public art or just a crazy landlord? Where is it?
How long has it been around?

Hello.

It's called "Defenestration."  It's at 6th & Howard Street. It's been
around since 1997. It's an art project.

See:
Defenestration.org: Press Release
http://www.defenestration.org/press.html

CNN: "Furniture gallery in the sky"
http://www.cnn.com/US/9703/17/fringe/flying.furniture/index.html

Metaphorm.org: Denefestration
http://www.metaphorm.org/pages/portfolio/defenestration/defen.html

There's also a little write-up about it on virtualtourist.com
http://www.virtualtourist.com/vt/b870f/6/2db/
Another photo:
http://p.vtourist.com/984795.jpg

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search strategy:
"san francisco" "hanging furniture"
"san francisco" "furniture hanging"
"defenstration" "howard st"

I hope this helps.

Thanks so much. That's exactly what I needed.