London Remains World
Market, Cost Per Sq. Ft., Q1 2014
11 New York-Midtown Manhattan $120.65
15 San Francisco-Downtown $108.00
22 Boston-Downtown $93.75
26 Washington DC-Downtown $85.67
29 New York-Downtown $82.55
30 Los Angeles-Suburban $82.49
46 San Francisco-Peninsula $68.31
I'm assuming that LA-Suburban is actually the Westside.