459 Mill St | 15, 21, 31, 40 and 44 fl | Proposed

[panamaniac]

Is Rockway the one that barely pays any taxes or are my wires crossed?

You might be thinking of the Westmount Golf Club.  They continue to be classed "Agricultural" in exchange for allowing public access to the property for things like cross-country skiing (and presumably other times of the year as well).

The section of the golf course across Courtland is a later addition to the original course, is it not?

If anything, Courtland may have been pushed south through the property.

I don't really know, but since Mill St is much older, I'm guessing that today's Courtland follows what used to be Mill (hence the odd intersection where Mill St now ends).  Mill St would long predate the Rockway Golf Course, which opened during the Depression as did the Rockway Gardens.