t rent adjustment under the Rent Stabilization Ordinance. (d) Each owner must upon complying with the requirements of Subsection (a) submit a Certificate of Compliance or Owner-Certified Notice of Compliance to the Department of Water and Power which complies with the requirements of Section 122.06. (e) In addition to the provisions of Subsection (a), prior to entering into an agreement of sale or contracting for an exchange of any real property improved with residential, commercial, or industrial buildings, or when an escrow agreement has been executed in connection therewith, prior to the close of escrow, each owner or owner’s agent shall: 1. equip all urinals with flushometer valves which flush urinals with a maximum of one and one- half gallons of water per flush; 2. ensure that all showerheads are low-flow showerheads which are in compliance with the energy efficiency standards as described in Title 20 of the California Administrative Code. 3. ensure that all water closets are equipped either with flushometer valves which flush with a maximum of three and one-half gallons or with water closet flush-reduction devices. This requirement shall not apply to any water closet that does not use more than an average of three and one-half gallons per flush. 4. effective January 1, 1999, where the real property which is the subject of the sale has been improved with residential buildings, ensure that all water closets are low consumption water closets.