The second home and Headquarter of the Teenage Mutant Ninja Turtles in IDW. It appears for the first time in number 15 of their collection, and is the base of operations of the team until the transfer of the Turtles to Mutant Town starting with number 101 of the series.
The Chruch Lair is an old abandoned church with a multi-story nuclear shelter under it. In addition, the shelter has direct access to the river and the New York City sewer system.
The Turtles, Master Splinter, Casey Jones and Pepperoni live there. Over time, he has been attacked by Slash, Baxter Stockman, and the Foot Clan over time.
At present, it is part of the territory of the Mutant Town, but the Turtles have decided to temporarily abandon it, not needing to hide in an entire city of anthropomorphic mutants.