I know Bright trading has an office there. Or at least the last time I heard. I know a guy who traded there.
Vinny my firm Echo has an office there also. Contact Jonathan@echotradeonline.com for more info. look at this link for offices http://daytradingstocks.com/tradingoffices.html
Why do folks here use a day trading firm? Ie: why go to an office, when you can do it all from your home?