Insurance Code § 1194
ARTICLE 4. Property Authorized for Excess Funds Investments
Excess funds investments may be made in bonds issued by any county, municipality, or school district in this State to represent assessments for local improvements authorized by law. At the date of such investment the purchase price or principal loaned shall not exceed fifty per cent of the market value of the real property or of the real property together with the improvements thereon, upon which the bond is the first lien.