Long time ago condos could be bought core & shell but it wasn't that common and only reserved for either very exclusive developments or extremely large units. I remember inquiring about buying a condo unit core and shell long ago and the builder offered only a 15% discount on the finished selling price.
These days developers will not offer this option, with exception of special penthouse units sold at a huge premium -- there is simply no profit to be had here as developers make money on finished units where they can mark up on the finished cost and also it creates complications with the Tarion.
To satisfy the Occupancy Certificate at closing, the unit must have an operating toilet and sink and an additional sink for the kitchen, amoung a few other minor details. For core and shell units the builder will temporarily put the cheapest toilet and free-standing sinks where the rough-ins are located.
I am very interested in seeing how these four townhouses will eventually be finished on the inside. At this price point I'm sure they will be stunning, however with a $2.4m blank canvas you will need to spend at the very least $100/sq.ft. to finish it at a decent level, so that puts these townhouses north of $3 million each when completed, even more if you want to match the level of quality of the interior with the exterior. A rather princely sum considering the street is not particularly exclusive or prestigeous.