Pro tip for overturemaps building footprint downloads: While the official data download can be tricky, explore.overturemaps.org is a handy alternative (though limited to zoom 15). Need to check multiple areas? Here's a QGIS field calculator hack:

'https://explore.overturemaps.org/#15/' || to_string(y(centroid($geometry)), 5) || '/' || to_string(x(centroid($geometry)), 5)

This generates clickable URLs for each grid cell! 🗺️ #QGIS #OpenData #overturemaps