Minn. Stat. § 473H.14: ANNEXATION PROCEEDINGS.

Agricultural preserve land within a township shall not be annexed to a municipality pursuant to chapter 414, without a specific finding by the chief administrative law judge of the state Office of Administrative Hearings that either (a) the expiration period as provided for in section 473H.08 has begun; (b) the township due to size, tax base, population or other relevant factors would not be able to provide normal governmental functions and services; or (c) the agricultural preserve would be completely surrounded by lands within a municipality.

This section shall not apply to annexation agreements approved under proceedings authorized by chapter 414 prior to creation of the preserve.