The nest has been destroyed and the entry points sealed.
It should be safe enough to use the stairs now.
Access to the courtyard is still restricted due to construction which will be resuming early next week, weather permitting.
Please exercise due caution throughout the building for any wandering wasps, although they seem to head straight for the light of the courtyard door and window.
Also, please notify Ted any time you spot a wasp nest on the property.