N.Y. General Municipal Law § 11
2. a. The governing board of any local government or, if the governing board so delegates, the chief fiscal officer or other officer having custody of the moneys may temporarily invest moneys not required for immediate expenditure, except moneys the investment of which is otherwise provided for by law, either: (1) in special time deposit accounts in, or certificates of deposit issued by, a bank or trust company located and authorized to do business in this state; or (2) in accordance with all of the following conditions:
(v) at the same time that the local government's moneys are deposited and the certificates of deposit are issued for the account of the local government, the bank or trust company receives an amount of deposits from customers of other financial institutions equal to or greater than the amount of the moneys invested by the local government through the bank or trust company. b. For any investment made pursuant to paragraph a of this subdivision, such time deposit account or certificate of deposit shall be payable within such time as the proceeds shall be needed to meet expenditures for which such moneys were obtained and provided further that such time deposit account or certificate of deposit be secured in the same manner as is provided for securing deposits of public funds by subdivision three of section ten of this article. * 3. a. Investments pursuant to this section may also be made in the following:
(v) no-load money market mutual funds registered under the Securities Act of 1933, as amended, and operated in accordance with Rule 2a-7 of the Investment Company Act of 1940, as amended, provided that such funds are limited to investments in obligations issued or guaranteed by the United States of America or in obligations of agencies or instrumentalities of the United States of America where the payment of principal and interest are guaranteed by the United States of America (including contracts for the sale and repurchase of any such obligations), and are rated in the highest rating category by at least one nationally recognized statistical rating organization, provided, however, that no more than two hundred fifty million dollars may be invested in such funds. b. All investments made pursuant to this subdivision shall be subject to the following conditions: