BUFFALO, N.Y. (WIVB) -- Mulligan's Brick Bar on Allen Street is set to be demolished Tuesday morning after a large fire broke out early Sunday morning, causing an estimated total of $2.1 million in damage, city officials said. Crews will start demolition at 9 a.m. An investigation by the Buffalo Fire Department and the Bureau of Alcohol, Tobacco, Firearms and Explosives has officially ruled the cause of the fire as undetermined and it's being classified as accidental. Officials said the fire was mostly likely the result of an electrical or mechanical malfunction. The fire broke out just before 4 a.m. Sunday and caused an estimated $1.5 million in damage to the building’s structure and $600,000 to its contents. "There are truly no words to express the heartbreak I feel for my bar — our bar — Mulligan’s Brick Bar," Mulligan's owner Kim Rossi said in a statement. "Following the devastating fire that occurred early Sunday morning, I am deeply saddened to share that the damage is beyond repair, and the bar is a total loss." Rossi said she is donating salvageable items of historical significance to the Buffalo History Museum. "Since the fire, the city was in close discussions with the owner in exploring multiple options to avoid total demolition," Acting Buffalo Mayor Chris Scanlon said in a statement. "However, after careful consideration with the business owner, along with the urgent need and time sensitivity to address the immediate risk to public safety, and concern for the impact on other Allen Street businesses, we are in agreement to proceed with the demolition of Mulligan’s Brick Bar." The building has been in the area since 1897 and is located next to where The Old Pink once stood before it was destroyed in a fire back in June. That fire caused an estimated $1.25 million in damages. John W. Burns, 40, of Buffalo, was arrested and charged with setting fire to The Old Pink in September. In a press conference Sunday afternoon, officials said that there was no connection between the two fires. The Allentown Association on Sunday had called for the preservation or partial preservation of the bar, with the building's facade being a priority. Latest Local News Mulligan’s Brick Bar to be demolished Tuesday after large fire Kaisertown community on edge after uptick in property damage April Baskin sworn in as state senator for 63rd district Fire causes $130K in damage to Buffalo home, displaces 3 Officials discuss demolition after fire causes $2.1 million in damage to Mulligan’s Brick Bar Katie Skoog joined the News 4 team in April 2024. She is a graduate from the University at Buffalo. You can view more of her work here.