Law Barracks, named for Major General Evander M. Law, C.S.A., Citadel 1856, was completed in 1939. This building was refurbished in 1977. As of the 2004-2005 school year, the Law Barracks was closed. It will be demolished in 2005 and will be rebuilt.
Source: http://www.citadel.edu/
For each member of the Citadel a card was created that outlines their life and work at the school. Here is the information on Law that was provided to me by the Alumni Association:
Brigadier General Evander McIver Law, CSA: Born in Darlington, SC, on Aug. 7, 1836. Admitted to The Citadel on Jan. 1, 1853 at age 16. Other entries: Arsenal Trfd. Citadel Jan. 1, 1854. 3rd Lt. and asst. teacher in Belles Letters (?-hard to read) 1856. Graduated: Nov. 1856. Surveyor - farmer - teacher and editor. Served in 4th Ala. Regt. Promoted to Maj. General, 1864. Died Oct. 31, 1920 at Bartow, FL. At the time of his death, he was the ranking surviving officer of the Army of the Confederate States. Moved to Florida in 1893 and established the South Florida Military Institute at Bartow. Editor, Bartow Courier. Brigadier General, Oct. 31, 1862. (This obviously was before Maj. General in 1864, above.) Was in command of the city of Columbia when Sherman approached. Taught at King's Mountain Military Academy in Yorkville, and in 1860 moved to Macon County, Alabama, where he taught at the Military High School of Tuskegee, of which he was joint-founder with Robert Parks. In 1861 recruited a company largely from his school and as captain took it into action at Pensacola. Promoted to Lt. Col.; severely wounded at First Manassas. Participated in all of the most important campaigns in the East, was promoted to colonel, then to brigadier general. When Hood was wounded at Gettysburg, Law led the division and once more at Chicamauga (?) when Hood was again wooded. Leadership won him the praise of Gen. Longstreet. At Cold Harbor again severely wounded. Relieved of his command at his own request, was assigned to the cavalry and in Johnson's army in NC, commanding Butler's brigade under Hampton, participated in the attack on Kilpatrick's camp. Served on the staff of Gen. Johnson at Bentonville and just before the surrender, at the suggestion of Generals Johnson and Hampton, was promoted to major general. In 1863 he married Jane Elisabeth, daughter of William a. Latta, wealthy planter and railroad man, whose estate Law administered. Lived as a planter for a while in Tuskegee and Yorkville, resuming his connection with King's Mountain Military Academy until it closed in 1884. Then moved to Bartow, FL, to open the South Florida Military and Educational Institute, modeled after The Citadel and the Virginia Military Institute. Resigned in 1903 to become editor of the Bartow Courier-Informant. The #3 barracks at The Citadel was named "Law Barracks" in his honor.
Source: http://www.citadel.edu/
Special Thanks to: Carolyn Gorman, Citadel Alumni Association for the information on Law and the Law Barracks
Law's rival Micah Jenkins has a hall named in his honor as well. Here is the hall:

Jenkins Hall, situated next to Thompson Hall, is named for Brigadier General Micah Jenkins, C.S.A., Citadel 1854, who founded King's Mountain Military School. One of General Robert E. Lee's favorite officers, Brigadier General Jenkins was among four graduates who attained rank of general during the Civil War. Jenkins Hall houses the Departments of Aerospace Studies, Military Science, and Naval Science; Air Force, Army, Marine and Navy ROTC offices; the Commandant's Office; an auditorium, classrooms and supply rooms. In addition, the Cadet Corps' arms room is in Jenkins Hall.
Source: http://www.citadel.edu/