The most expensive home in Brooklyn's Dumbo neighborhood is currently under contract and is expected to close in the next few months (at least according to the WSJ). It is a 4,270 square-foot penthouse, with a 500 square-foot terrace, that occupies the full top floor of Olympia Dumbo.
The asking price / contract price is $17.5 million, which works out to be about USD 4,098 per square foot (or CAD 5,486 per square foot based on the exchange rate right now). Based on this price per pound, an equivalent 600 square foot suite would cost you about CAD $3.3 million.
The land was purchased in 2018 for about $98 million. I don't know what the total GFA of the building is, but it does have 76 residences, so that works out to about USD 1,289,473 per suite (or CAD 1,726,624 per suite), for the land cost alone.
This should give you an indication of what the end suite pricing would need to be to make this development feasible, and likely also speaks to its average suite size. New York City tends to build much bigger suites. Certainly compared to here in Toronto.
Also, notice that I didn't say unit?