Plaintiff engaged in a large development project in Oakland to rehabilitate an abandoned aggregate mine and build multi-family and single family residences on the property, along with various amenities.  Plaintiff entered into a contract with the City which specified that by paying a specified sum, plaintiff satisfied its fee payment obligations to the City.  Years later when plaintiff applied for additional building permits to construct additional residences, the City imposed additional affordable housing impact fees in accordance with ordinances adopted after the contract with plaintiff.  Held, plaintiff must pay the fees.  To the extent the contract purported to immunize plaintiff from the effect of later-enacted land use controls such as the impact fee, it was unenforceable as against public policy.  A governmental entity may not contract away its police power, and land use regulation is an exercise of that power.