My understanding -629 King Street West and 38 Stewart Street. The main building services for both towers are located in 38 Stewart (the rooftop of 629 King has Lavelle). After the buildings at 629 King Street and 38 Stewart Street were ready (or really, somewhat ready..) for occupancy, the start of move in's was delayed for a number of weeks. When the final water supply connections were being made to the water main under Stewart Street, it was found that the pipe was inadequate, and the resulting pressure drop would go below the minimum required by Toronto Fire Department for their purposes. A whole new water service had to be planned, engineered, and then constructed from the King Street side, through the basement to the 38 Stewart Street building to connect to the in-building services and distribution.
Another instance - King Blue. A large portable generator had to be used for a number of months at a great cost (if I recall correctly, around $20,000 per month) to power the cranes. Application had been made to the City / Toronto Hydro for feed from the nearby electrical vault in front of Bisha - but the application got lost, and no connection was made.
These are just two local incidents that I am aware of.....