Taxpayers considered to be affected taxpayers eligible for the postponement of time to file returns, pay taxes and perform other time-sensitive acts are those taxpayers listed in Treas. Reg. § 301.7508A-1(d)(1), and include individuals who live, and businesses (including tax-exempt organizations) whose principal place of business is located, in the covered disaster area. Taxpayers not in the covered disaster area, but whose records necessary to meet a deadline listed in Treas. Reg. § 301.7508A-1(c) are in the covered disaster area, are also entitled to relief.

https://www.irs.gov/newsroom/irs-announces-tax-relief-for-victims-of-severe-winter-storms-flooding-landslides-and-mudslides-in-california