Benjamin Hammar, a stonemason for the Denver & Rio Grande Railroad who worked on many depots (see DA06), later owned the Castle Rock Stone Company and the Santa Fe (railroad) Quarry. His story-and-a-half house of pink and gray rhyolite has steep-pitched side gables and a distinctive cross-gabled front entry with a frame porch topped by a small balcony. The T plan has a clapboarded frame north wing. The stone portion of the house has smooth stone sills and arched window tops with raised keystones. Reveals below the lintels are incised with Eastlake carving. Inside, original pine floors, wood-work, and cupboards remain in this well-preserved house. After Hammar departed, this was the home and office of Dr. George E. Alexander from 1902 until his death in 1947.