Specifications include, but are not limited to: The City expects to compensate the bank on a fee basis but reserves the right to change to a compensating balance. Both methodologies anticipate use of a sweep to a money market mutual fund. Under this contract the City anticipates a consolidated account structure with the Operating Account (as a master account) and all but five accounts as ZBA subsidiary accounts. The master account would be swept daily to an SEC registered government money market mutual fund striving to maintain a $1 NAV. Prime money funds (short duration funds), repurchase agreements and offshore accounts are not acceptable sweep vehicles. An image lockbox is required as detailed below in Section 3.