Here are few designs, you might find interesting (#77, #78), with stylized "W" incorporated int city silhouette,...contemporary and simple geometric design.
Also, on entry #80, thare's one pro-looking, even more simple design, without the "W", but incorporating books on the shelve, forming city silhouette! On entry #81, there's hint of the "W" in design! More colorful version (like in #78) can also be applied if you like any of these concepts! Any thoughts/suggestions!? Thanks!
...one more pro-looking design on #87,...it is a bit out of the box, in regards on your design brief, but it might be interesting branding solution! Negative space version on #88!
..and there are few more concepts on #150, #151, #152, #153. I'm trying to stay away from Darien logo, because someone might interpret this as "piggybacking" on their brand, and that migth get you into trouble! Similar thing is right now going on with Starbucks and one similar company in Vietnam, called "Golden Mountain",...it is a mess! :)