https://www.centerforbuilding.org/singlestair-tracker There is a great snapshot here of all of the work in the US and Canada to fix building codes. Mexico to my knowledge has always allowed this so they can work on something else. #buildingcodereform #housing #singlestair
Single-Stair Tracker — Center for Building in North America

Up-to-date list of legislative and other efforts across North America to reform egress code provisions to allow taller single-stair buildings.

Center for Building in North America
Here is an example from Mexico that architect Conrad Speckert included in his thesis on this https://www.archdaily.com/907302/aira-anonimous #design
AIRA / anonimous

Completed in 2018 in Santiago de Querétaro, Mexico. Images by Yoshihiro Koitani, Zolezzi Uribe. Located in one of the most extensively developed areas in the north of the city of Querétaro, and 100m from one of the principal avenues, AIRA is a...

ArchDaily