N.Y.C. Admin. Code § 13-539: § 13-539 Prohibition upon members and employees.

Except as provided in this chapter, the members and employees of the retirement board are prohibited from having any interest, directly or indirectly, in the gains or profits of any investment made by the retirement board or as such, directly or indirectly, from receiving any pay or emolument for their services. The members and employees of such retirement board, directly or indirectly, for themselves or as agents or partners of others, shall not borrow any of its funds or deposits or in any manner use the same except to make such current and necessary payments as are authorized by such board; nor shall any such member or employee become an endorser or surety or become in any manner an obligor for moneys loaned by or borrowed of such board.