Pattern 195: STAIRS VOLUME___Every staircase occupies a volume, two stories high. (...) It may be straight, L-shaped, U-shaped, or C-shaped. (...) Do not assume that all stairs have to have the "standard" angle of 30 degrees. (...) As you work out the exact slope of your stair, bear in mind the relationship: riser + tread = 17.5 inches.___from A Pattern Language
Grand staircase in Shoreland, Chicago - Part of the renovation of a Jazz age hotel into residential building by Studio Gang 2014.