Lauritzen Gardens in Omaha has done the same thing. Usually it's outdoors but this week it's inside in conjunction with the poinsettia show. My wife and I went this morning and saw some very beautiful poinsettias.
Here's a couple pictures I took today.

20ft. Poinsettia Tree:



Lauritzen Gardens building:



First National Bank Tower (on left), Woodmen of the World Tower (on right)



Don