It's not necessarily too small, though something like this will probably never happen;
On a somewhat separate note, I don't understand what this city's aversion to attached housing is, from either a historical perspective or the present day. I get that you need driveways and garages but why can't you build on top of them? It's one thing when you have a triple decker built 80 years ago, not much you can do there, but in new construction there is just no excuse to have that much space between homes when you are in the midst of a housing supply crises.
It seems culturally ingrained to have detached buildings compared with other northeastern cities with more rowhouses or even San Francisco which has some pretty poorly designed low density outer neighborhoods but has almost no detached homes anywhere. In Boston it's pretty much the opposite outside of the inner core. You find the sporadic rowhome street in places but it's mostly detached housing with driveway sized spaces between them and I don't understand why that is - cross ventilation can't be that big a deal. Does anybody know the historical context?
To bring it back on topic I will say that the townhomes on Lamartine are much better in terms of not wasting space, albeit with uninspired design.