Minn. Stat. § 40A.121: ANNEXATION PROCEEDINGS.

Subdivision 1. Annexation prohibited.

Land within an agricultural preserve that is within a township may not be annexed to a municipality under chapter 414, unless the chief administrative law judge of the state Office of Administrative Hearings finds that either:

(1) the owner or the county has initiated termination of the zone under section 40A.11;

(2) because of size, tax base, population or other relevant factors, the township would not be able to provide normal governmental functions and services; or

(3) the zone would be completely surrounded by lands within a municipality.

Subd. 2. Exception.

This section does not apply to annexation agreements approved under chapter 414 prior to creation of the zone.