The Texas State Capitol is located in Austin, Texas, and is the fourth building to be the house of Texas state government in Austin. It houses the chambers of the Texas Legislature and the office of the governor of Texas. It was originally designed in 1881 by architect Elijah E. Myers, and was constructed from 1882 to 1888 under the direction of civil engineer Reuben Lindsay Walker. A $75 million underground extension was completed in 1993. The building was added to the National Register of Historic Places in 1970 and recognized as a National Historic Landmark in 1986. The Texas State Capitol building is 308 ft (94 m) tall.