Question: How many people does the arena across the street from HarborCenter seat?
Sentence (from "KeyBank Center"): It is the largest indoor arena in Western New York, seating 19,070 fans in its normal configuration, and was constructed primarily for the Buffalo Sabres of the National Hockey League (NHL), who have called the arena home since 1996, when it replaced the now-demolished Memorial Auditorium.
Relevant evidence: Yes