In this podcast episode, Jennings Anderson, a research scientist at Meta, discusses the Overture Maps Foundation, a downstream product of OpenStreetMap.
He explains his background in open map data and his interest in studying collaboration within the OpenStreetMap community.
Jennings then dives into the Daylight Distribution, an open data product produced by Meta, and how it combines building data sets from various sources into one unified theme.
Jennings emphasizes the importance of a stable ID system within the Overture Maps Foundation and the potential for easy conflation and integration of third-party data.
Jennings also explains the relationship between OpenStreetMap and Overture Maps, highlighting how they complement each other.
 
Relevant podcast episodes 
OpenStreetMap Is A Community Of Communities
Cloud Native Geospatial
Cloud Optimized Point Clouds
The Rapid Editor



With regards to accessing Overture Map data, you might find this YouTube video helpful
https://youtu.be/fZj6kTwXN1U?feature=shared
 
Just in case you are interested in the Google building footprints here is a link to that :) 
https://sites.research.google/open-buildings/