The statute that governs where the 20 day preliminary notice is to be served. Civil Code section 8108 states that a notice shall be given at the person’s residence, the person’s place of business, or, in the case of an owner (who is not a public entity) at the owner’s address shown on the direct contract, the building permit, or a construction deed of trust. The notice that was served on was mailed to the project address. When we served the Mechanic’s Lien we obtained the business address from the Secretary of State website. My interpretation is that the Notice was sent to construction site/ business address. The Developer provided an unconditional waiver & release of final payment with the owner listed as a corporation and the site address which was the same where we delivered our materials. The Sales Invoice indicates the same address we sent the materials to the project address and on the building permit, and the construction deed of trust which we obtained the property detail report . We verified with the title company and it is the same corporation owner. Is this a valid filing if we delivered the materials on 8/13 and sent the certified mailing for the Prelim on 8/21?