Barry Horowitz became Girl Scouts of the USA's (GSUSA) chief revenue officer in April 2015, after nearly ten years leading its Girl Scout Merchandise team, which is responsible for product development, wholesale and retail distribution, marketing, and licensing of Girl Scout uniforms and branded products.
2-1/2 feet x 5 feet is the standard bath tub size. 32 inches x 32 inches is the typical size of shower stalls. 2-foot depth is standard for actual space for clothes along a closet wall. 3-foot hallways are standard inside a home. 2-foot deep cabinets in the bathroom are standard. 32-inch doorways are ideal.
In general, they are 8-9 feet wide. The ADA stall will be 5' wide, and add 3 feet for each additional stall. Also add 3 feet for urinals, and a minimum of 4 feet for each sink. An office that large, if it only has 1 bathroom for men and another for women, will probably have a minimum of 5 stalls/urinals and 2 sinks. In that case, you are looking at 9 x 25, or 225 sq. ft. Hope this helps.