Block 21 is a $300 million mixed-use development complex located in the Second Street District of Downtown Austin, Texas. Austin's eighth-tallest building, the W Austin Hotel and Residences and Austin City Limits Live at The Moody Theater, the live venue where Austin City Limits is recorded, are located here, as well as of shops, restaurants and office space. The complex has been lauded for its eco-friendliness. References Buildings and structures in Austin, Texas Mixed-use developments in Texas