IOWA CITY — When Bob Franklin was considering leasing the former Blue Moose in downtown Iowa City and transforming it into a Nashville-inspired music venue, it wasn’t the space or location that got the deal across the finish line for him.It was the alley. More specifically, it was the plan Iowa City’s Downtown District has to transform that space from a dank and uninviting stretch between Dubuque and Linn streets to an attractive destination.