In Houston:
North of West Belfort at the Railroad Tracks about 1/2 mile east of the intersection of Post Oak. Look for the nest one or two poles north of West Belfort. I used to live in this neighborhood and often saw them while walking on the Braes Bayou Greenway that runs along Braeswood between Loop 610 and Stella Link.
In the City of Bellaire there was a nest in the Tower at the intersection of Willow Bend and Renwick.
In Kemah there is a nest that has been active for 20 years. It is visable on the west side of SH146 from the bridge in the powerlines