I don't believe it was.
Wikipedia says this about the location of the movie:
"Chicago is what I am," said Hughes. "A lot of Ferris is sort of my love letter to the city. And the more people who get upset with the
fact that I film there, the more I'll make sure that's exactly where I
film. It's funny—nobody ever says anything to Woody Allen about always
filming in New York. America has this great reverence for New York. I
look at it as this decaying horror pit. So let the people in Chicago
enjoy Ferris Bueller."
So there doesnt' seem to be any indication that the location was inspired by Blue's Brothers, but rather it was Hughes' fascination with the city that inspired him to shoot there.
I think they just happened to have some similer characteristics.