California Codes, Civil Code - CIV, Division 3 — Obligations, Part 4 — Obligations Arising from Particular Transactions, Title 14 — Lien, Chapter 2 — Mortgage, Article 2 — Mortgage of Real Property, Section 2949

(a) No mortgage or deed of trust on real property containing only a single-family, owner-occupied dwelling may be declared in default, nor may the maturity date of the indebtedness secured thereby be accelerated, solely by reason of the owner further encumbering the real property or any portion thereof, with a junior mortgage or junior deed of trust.

(b) As used in this section, “single-family, owner-occupied dwelling” means a dwelling which will be owned and occupied by a signatory to the mortgage or deed of trust secured by such dwelling within 90 days of the execution of such mortgage or deed of trust.