23 C.F.R. § 710.201
(c) ROW manual.
(2) The SDOT's ROW manual must be developed and updated, as a minimum, to meet the following schedule:
(d) ROW manual alternatives. Non-SDOT grantees, and all subgrantees, design-build contractors, and other acquiring agencies carrying out a project funded by a grant under title 23, United States Code, must demonstrate that they will use FHWA-approved ROW procedures for acquisition and other real estate activities, and that they have the ability to comply with current FHWA requirements, including this part. This can be done through any of the following methods:
(3)
(e) Record keeping. The acquiring agency shall maintain adequate records of its acquisition and property management activities.
(1) Acquisition records, including records related to owner or tenant displacements, and property inventories of improvements acquired shall be in sufficient detail to demonstrate compliance with this part and 49 CFR part 24. These records shall be retained at least 3 years from the later of either: