The new building, at the corner of St. George Boulevard and St. Mary Street, is the third building in a five-block neighbourhood to undergo a complete demolition.
The other two were demolished in 2017 and 2017-18.
The new one will be one of the tallest buildings in Ottawa, and it will include a new restaurant and a new retail area.
It will also include new amenities for tenants and the public.
The demolition will start this week, and will last about a year.
It was a long process, and a challenge.
The building was demolished for the purpose of making way for a new school.
In addition, the city has set aside $300.5 million for demolition of vacant buildings.
The city’s heritage office has also partnered with Ottawa Landscape Architects to help design the new building.
“This is the largest demolition project we have ever undertaken in Ottawa,” said Dave O’Neill, the director of heritage at the city.
“I would say that this is the most complex demolition project that we have undertaken in the city of Ottawa.”
The work will take place on the site of the former St. Joseph Catholic School, which is now part of the downtown community.
There are also plans to add a new Catholic church on the old site, and to convert the old St. John’s Church to a park.
The project is expected to be complete in 2023.