Collateral is required for all uninsured certificates of deposit or other deposits with banks and savings and loan associations. The market value of collateral must be maintained during the life of the investment at a level equal to or greater than the amount of the investment. All collateral securities must be delivered to, and held by, a third party trustee. An undivided interest in the securities pledged as collateral must be granted to the City. Eligible securities for collateralization shall be limited to obligations of the United States government, its agencies and instrumentalities whose maturities do not exceed five (5) years, measured from the date of the City’s investment transaction.