Me. Rev. Stat. tit. 30-A, § 4328

In order to comply with the requirement in section 4326 for each municipality to adopt land use policies and ordinances to discourage incompatible development, a municipality may adopt a transfer of development rights program for the transfer of development rights within its boundaries. Two or more municipalities may adopt a program that provides for the transfer of development rights between the municipalities if the municipalities have entered into an interlocal agreement pursuant to chapter 115 for this purpose.