California Code, Government Code - GOV § 45308.3

Notwithstanding Section 45308.1, funds received by city retirement systems and not required for current disbursements may be invested in bonds issued pursuant to the Improvement Bond Act of 1915;   1  provided, that an ad valorem tax on all property taxable by the public agency which authorized the issuance of such bonds, at a rate not exceeding ten cents ($0.10) for each one hundred dollars ($100) of assessed value, computed as of the date of such investment, would produce an amount equal to at least 100 percent of the principal and interest payable in any year thereafter on the issue of bonds in which such investment is made.