Sec. 2. (a) The entire land upon which the building, erection, or other improvement is situated, including the part of the land not occupied by the building, erection, or improvement, is subject to a lien to the extent of the right, title, and interest of the owner for whose immediate use or benefit the labor was done or material furnished.
(b) If:
(1) the owner has only a leasehold interest; or
(2) the land is encumbered by mortgage;
the lien, so far as concerns the buildings erected by the lienholder, is not impaired by forfeiture of the lease for rent or foreclosure of mortgage. The buildings may be sold to satisfy the lien and may be removed not later than ninety (90) days after the sale by the purchaser.