Are you using light shafts in the directional light? If so, the Bloom Tint setting might be greenish, even if it is partly blue / red.
If by deleting the windows, it removes the green, perhaps those windows’ glass material has green in it.
Color temperature is measured in Kelvins, and might be outputting a green tint…or if it’s a ‘warmer’ temperature (usually associated with yellow / orange) it could be mixing with the blue in the HDRI. Yellow + blue is green, and if it’s a bit orange would probably offset the green to the more jade-like green in the screenshot. So, if rebuilding things doesn’t get rid of it, then try checking those aspects.