Governments in several German states discuss or propose land market regulations. In this paper we analyze the proposed land market regulations of the NASG in Niedersachsen with an agent-based approach. Our simulation results show some unexpected effects. While rental prices for arable land increase slower due to the regulations, they increase faster for grassland. The number of small farms decreases because they grow into a larger size class. Regarding farm profits, medium and large sized farms can benefit the most, while very large farms are disadvantaged. Overall, the results show a differentiated picture, as the policy’s desired effects cannot entirely be achieved.