To unlock The Police Station Lot, you need to collect Deputy Badge and pay 60000 Coins to reclaim the Lot. Upon reclaiming the land, you need to fight agains the new Ice Block Zombie on the waste land. After winning the battle, you get Shamrock as a new Plant.
Plants vs Zombies Adventures The Police Station Lot – All stats
All the stat of Plants vs Zombies Adventures The Police Station Lot including new Plant and new Zombies to unlock as well as how to unlock or reclaim the Lot are shown in the table below:
Plants vs Zombies Adventures The Police Station Lot stats
||The Police Station Lot
||Ice Block Zombie
||Available after collecting Deputy Badge and paying 60000 Coins
For a complete guide on PvZ Adventures Beta, go here.