Put up a bird house with a big front hole, or maybe a three-sided one.
They’re famous for doing other birds out of nice spaces like that - they are especially damaging to bluebirds, that way.
You could probably rough one up out of a few small pieces of wood that would provide protection from the wind, and hammer it up somewhere near where they are trying to nest.
That is, if you really want them around....:-)
You could probably even do this with a nice deep piece of tupperware, nailed to the wall...
Great idea except this is a metal awning on the second floor and the building is brick. No access to it.
I’ve enjoyed having them without a doubt. The awning seems to attract birds every year that perch up in there but this is the first I’ve seen them build a nest. I hope they’re successful.