After a municipality notifies the department of its intent to enter into compulsory fire protection contract negotiations (WAC 365-80-140), the department shall request a written report from each state agency in that municipality identifying the agency's state-owned facilities located therein. The report shall provide the square footage for each agency, and shall be submitted to the department within twenty days after receiving the request. The square footage shall be calculated as of July 1 of the fiscal year for which payment shall be made. No adjustments will be made until the following year for new facilities built or acquired after the determinations have been made.