ITHACA, N.Y. – For years, the City of Ithaca’s Collegetown neighborhood has had at least a few construction sites running, and this summer is no exception. Following part one of this summer’s construction series, which looked at Cornell, this second installment takes a look at Gun Hill and Collegetown. The Summit (201 Oak Ave.) Unlike many parts of Tompkins County where there’s been a lull in new residential projects, Collegetown benefits from …