(a) A lien provided for in AS 34.35.050 — 34.35.120 does not bind real property for more than six months after the claim of lien is recorded, unless an action is commenced in the proper court to enforce the lien within
- (1) that time; or
- (2) six months after recording of an extension notice in the same recording office within the original six-month period showing the recording date and the book and page or instrument number or serial number of the initial claim of lien, and the balance owing.