Equinox is the #1 gym in the city. If anyone has a corporate discount they could share with me, that would be awesome!
My company offers a corp rate for Equinox. I also know someone who used the corp rate of a big bank for Equinox, even though they didn't work there.
Corporate gym rates typically don't involve codes. When you sign up-- either for yourself the employee, and/or your significant other, the dues are deducted directly from the employee's paycheck. (After taxes, I believe)
The guy I knew was close with the employee at the bank, so he probably trusted him to pay the dues to him directly. You need to find someone who's willing to have your gym dues taken from their paycheck.
As an aside, Equinox in NY is way too crowded. Depending on where you work/live, NYHRC and Chelsea Piers Sports Club are both much better.