Urban Planning model

Sometimes ago I found a interesting Model in the Tutorial : the urban planning model. It has completely disappeared now. Why?
Where can I find it?
Thanks for clarification

From the git history of JuMP:

It was taken out according to this PR:

The tutorial remains available in older versions of the JuMP documentation: The urban planning problem ยท JuMP (with the obvious caveat that old documentation is of historical interest only).