Nice photos! I don't think those palms look out of place at all.
Banana trees used as perennials are quite common here in northern Illinois also. They look nice when mixed with elephant ears and yucca. Rent-A-Palms are also popular here in the Quad Cities and many yards plus the streets of downtown Rock Island can have a tropical look all summer.
These royal palms are pretty short as they rent trees that are much taller but this is the only photo I have. They usually hide the planters much better also so they look more natural but places to do that are limited in downtown.