The Director of Finance may enter into an agreement prior to September 1, 1976, with the State Race Track Leasing Commission and the 22nd District Agricultural Association to commit the state to advance to the Architecture Revolving Fund a sum of not to exceed six hundred thousand dollars ($600,000), if needed, for the construction of improvements at Del Mar Race Track as described in work order AFD 410 of the Office of Architecture and Construction. Any such commitment shall be deemed, with respect to the project for which it is made, to constitute a deposit of funds available for expenditure by the Department of General Services for the purposes of Section 14957 of the Government Code. The Director of Finance, to the extent necessary to honor such commitment, shall authorize by executive order the withdrawal of an amount or amounts from the General Fund in the State Treasury not to exceed six hundred thousand dollars ($600,000) for transfer to the Architecture Revolving Fund. Any amount so transferred shall be used solely for the project for which the commitment was made and shall not exceed the amount necessary for the project, after deducting from the commitment the amount of all funds in the Del Mar Capital Improvement Account. Any sums so transferred shall be repaid to the General Fund, with simple interest at the average rate earned by the Pooled Money Investment Account for the month in which the transfer is made, from the first moneys placed in the Del Mar Capital Improvement Account (created by lease agreement of January 8, 1969, between the State Race Track Leasing Commission and the Del Mar Thoroughbred Club) not needed for the project for which the commitment was given; provided, that, in any case, such repayment in full with interest as specified shall be made from funds in such improvement account prior to October 1, 1978.