Imposing unilateral annexation restrictions on cities and expanding the causes of action for landowners to challenge such annexations.

SB 124 restricts Kansas cities' ability to annex land without owner consent and expands landowners' options to challenge annexations. It requires written permission from landowners to annex unplatted farm land of 21 acres or more, or any land under 20 acres, and bans annexing narrow corridors of land solely to access noncontiguous areas unless the corridor has a separate purpose. Landowners and nearby cities can now challenge annexations within 30 days, arguing the annexation was unreasonable, the service plan was inadequate, or the process was irregular. These changes apply to all annexations under Kansas law, affecting landowners and cities involved in boundary expansions.