$671 doesn’t seem super high if it includes a lot of parking and A+ condition.
I see OB/PB/LJ homes sell over $1k/sf regularly. If the commercial part includes a liquor license and there’s high end residential above, there you go, just average $900/sf for the residential half and 400/sf for the commercial bottom.
Interestingly, residential is worth so much more than commercial space that the city has to cajole and incentivize developers to include ground level commercial space.
I think it was at the Upper Voltaire high end townhouse development on the OB hill where the single commercial space was empty for years and eventually converted to residential.