Cal. Code Regs. tit. 18 § 5271
The Chief Counsel may grant a reasonable extension of time for the filing of any brief, upon a showing of reasonable cause. The request for an extension of time must be submitted in writing before the scheduled due date of any brief. If an extension of time is granted for the filing of any brief, the Chief Counsel will also grant an appropriate extension of time for filing a response to such brief.
Cal. Code Regs. Tit. 18, § 5271
Note: Authority cited: Section 15606, Government Code; and Sections 7051, 8251, 9251, 13170, 30451, 32451, 38701, 40171, 41128, 43501, 45851, 46601, 50152, 55301 and 60601, Revenue and Taxation Code. Reference: Sections 6074, 6456, 6538, 6562, 6592, 6593, 6593.5, 6596, 6814, 6901, 6902, 6906, 6981, 7657, 7657.1, 7658, 7658.1, 7700, 7700.5, 7711, 8126, 8128, 8191, 8828, 8828.5, 8852, 8877, 8878, 8878.1, 8879, 9151, 9152, 9196, 12429, 12636, 12637, 12951, 12977, 12978, 12981, 30175, 30176, 30176.1, 30176.2, 30177, 30178, 30178.1, 30243, 30243.5, 30262, 30282, 30283, 30283.5, 30284, 30361, 30362, 30365, 30421, 32255, 32256, 32256.5, 32257, 32302, 32312, 32313, 32401, 32402, 32402.1, 32404, 32407, 32440, 38433, 38435, 38443, 38452, 38453, 38454, 38455, 38601, 38602, 38605, 38631, 40093, 40102, 40103, 40103.5, 40104, 40111, 40112, 40115, 40121, 41087, 41096, 41097, 41097.5, 41098, 41100, 41101, 41104, 41107, 43157, 43158, 43158.5, 43159, 43303, 43351, 43352, 43451, 43452, 43454, 43491, 45155, 45156, 45156.5, 45157, 45303, 45352, 45353, 45651, 45652, 45654, 45801, 46156, 46157, 46157.5, 46158, 46302, 46303, 46353, 46501, 46502, 46505, 46511, 50112.2, 50112.3, 50112.4, 50112.5, 50116, 50120.2, 50120.3, 50139, 50140, 50142, 50151, 55044, 55045, 55046, 55046.5, 55083, 55102, 55103, 55221, 55222, 55224, 55281, 60209, 60210, 60211, 60212, 60332, 60333, 60352, 60501, 60502, 60506, 60507, 60521, 60522 and 60581, Revenue and Taxation Code.