Although I'd love it if Tower City had real retail (other than Brooks Brothers), I don't think you can fault Forest City or their targeted demographics. I think the bottom line is that retail is tough (and constantly shrinking) everywhere.
When it opened, Tower City had three levels that went from luxury on the top (e.g. Barney's, Fendi), to "upscale" on the second level (Banana Republic, J. Crew), to the Gap and Footlocker on the lower level. They all left. Tower City is a big mall, with 367,000 square feet of retail. By comparison, if you exclude the anchors, Beachwood Place has 398,000. Here's Beachwood's latest addition, which looks like it was stolen from Tower City. Pretty much says it all.