I gather that you would prefer the city of Toronto to have the authority to regulate the placement of such towers. But this is not feasible. A working cellphone system requires an even distribution of transmitters. If you start messing around with this, there will be some locations where cellphones won't work, since they'll be too far from the nearest transmitter. And this is not what cellphone users expect and demand.
Cellphones are a public utility.
You have no choice about the placement of power lines, phone lines, gas pipes, water pipes or sewage tunnels, and you have no choice about cellphone towers either. They go where they need to go, whether you like it or not. The only choice we do have, as a society, would be to accept or reject cellphone technology in its entirety. If we want the convenience of mobile phones to carry with us and use anywhere, then we must also live with the resulting microwave radiation and any resulting health problems. If we aren't willing to tolerate those health risks, then we must give up our cellphones and return to the previous system of using phones at fixed locations only.