500
In Pentagon (constructed 1941-1943), there is a double of the standard number of toilets necessary for this size of building. This is due to the 1896 Supreme Court decision of Plessy vs. Ferguson, where a series of laws made the mixing of the races illegal in schools or hospitals or theaters and even restricted blacks from drinking from "white only" fountains or using "white only" dressing rooms in department stores. In the US, this phenomenon was ended in writing in 1954, but still lasts in some places of the world.
What is segregation?