At $200k to build per 1500 sq ft single family home (possibly aggressively low, but I'm using this to guide my numbers, and trying to go average: https://wowa.ca/how-much-does-it-cost-to-build-a-house), for 90000 homes we're around $20 billion. Call it $25 billion with hookups (I don't know if that was included on wowa.ca)
In 2018 it cost $30 million to build an elementary school in Thunder Bay. Let's call it $50 million and for 56 schools we're at 3 billion dollars.