Though the concept of office buildings in general is taking a light beating in recent months, a 41-floor office and retail project by developer Ryan Companies is moving forward after securing a Density Bonus recommendation earlier this week from the City of Austin's Design Commission. That's good news for people who like interesting buildings, because the Gensler Austin-designed Tower 5C -- a name denoting its location at the southeast corner of West Fifth and Colorado Streets -- is a tower different in appearance from anything we've seen going up . . .