junctionist
Senior Member
St. Patrick's Cathedral in NYC is surrounded by towers, living in the shadows and it hasn't taken away from it's beauty or popularity one iota.
It depends on the groupings of buildings and their specific architecture; towers may be designed with curves or setbacks to address shadowing concerns. Highly reflective glass is another possible option, though one that produces unnatural effects and may not be bird friendly. Shadowing concerns often seem to stimulate architectural creativity for more distinctive design. I'm not very familiar with St. Patrick's Cathedral, but I imagine that a cathedral whose neighbours didn't take shadowing into consideration and now lacks natural light isn't that spectacular because you need natural light to appreciate many aspects of traditional Gothic design.