land mortgage, or right-of-way document, the applicable Bureau office shall conduct and complete a preliminary review of the residential leasehold mortgage, business leasehold mortgage, land mortgage, or right-of-way document to verify that all required documents are included. (B) Incomplete documents As soon as practicable, but not more than 2 calendar days, after finding that any required documents are missing under subparagraph (A), the applicable Bureau office shall notify the lender of the missing documents. (3) Approval or disapproval (A) Leasehold mortgages Not later than 20 calendar days after receipt of a complete executed residential leasehold mortgage or business leasehold mortgage, proof of required consents, and other required documentation, the applicable Bureau office shall approve or disapprove the residential leasehold mortgage or business leasehold mortgage. (B) Right-of-way documents Not later than 30 calendar days after receipt of a complete executed right-of-way document, proof of required consents, and other required documentation, the applicable Bureau office shall approve or disapprove the right-of-way document. (C) Land Mortgages Not later than 30 calendar days after receipt of a complete executed land mortgage, proof of required consents, and other required documentation, the applicable Bureau office shall approve or disapprove the land mortgage. (D) Requirements The determination of whether to approve or disapprove a residential leasehold mortgage or business leasehold mortgage under subparagraph (A), a right-of-way document under subparagraph (B), or a land mortgage under subparagraph (C)— (i) shall be in writing