If the CA payroll exceeds $56K, then there is nexus.
"The amount paid in California by the taxpayer for compensation, as defined in subdivision (c) of R&TC 25120, exceeds the lesser of $50,000[1] or 25 percent of the total compensation paid by the taxpayer.
For the conditions above, the sales, property, and payroll of the taxpayer include the taxpayer's pro rata or distributive share of pass-through entities. "Pass-through entities" means partnerships, LLCs treated as partnerships, or S corporations."
https://www.ftb.ca.gov/businesses/Doing-Business-in-California.shtml
The original $50K in 2011 jas been indexed for inflation.