Police on Friday afternoon closed off the southbound lanes of Erie Boulevard at Liberty Street after engineering crews monitoring the building told the city the potential for collapse was very high, police spokesman Sgt. Matt Dearing said. A year ago, during demolition of an adjacent building, the bistro owner told city officials the building was shaking and vibrating, causing cracking and separating of the walls, ceilings and floors. Engineers notified the city Friday that the building "poses an immediate threat to public safety and could collapse," Dearing said. [...] Schenectady Heritage Foundation Chairwoman Gloria Kishton said she believed the demolition would "extremely endanger" the Nicholaus building, and called for an engineering plan to be developed that would ensure its structural integrity.