TORONTO — An Alphabet company’s vision for a “smart city” project in Toronto includes buildings made of timber that are five times the current limit, potentially steering the company into the challenges of timber innovation in Canada. …Sidewalk’s project will be voted on by Waterfront Toronto’s board for final approval on March 31, 2020. …David Hine, a building code consultant with 30 years of experience in Ontario who has worked on timber buildings in the past, said that without “huge political influence,” he doubted a 30-story building would be permitted in code in the next 20 years. …“We’re trying to push as far as we can with the mass timber,” Karim Khalifa, Sidewalk’s director of buildings innovation, said in a phone interview, adding that they would look at hybrid buildings if necessary to satisfy the code.