Plenty of the members of the Dallas Arts District offer their own tours of certain collections or parts of their buildings. For more information on these specialty tours explore the links below.
Dallas Museum of Art: https://www.dma.org/visit/tours
Nasher Sculpture Garden: http://www.nashersculpturecenter.org/visit/tour
Crow Collection of Asian Art: https://crowcollection.org/learn/adult-tours/
AT&T Performing Arts Center: http://www.attpac.org/on-sale/2014/first-saturday-tours/