We'll start with some elderly façades - well, older anyway - which were typically graystones. I would assume that the term greystone comes from the what I presume to be Indiana limestone, which I guess was the most fashionable material at that time.
Here are two examples of this, both with bay windows, one with (non-original) balconies, which I suspect is somewhat newer and an older one without.
Then we progress on to what I call a "flat-front" façade, with inset balconies at the front. The balconies are "internal" in that they form a room within the face of the building, usually with a bedroom fronting onto it, with a side door from the living room onto the balcony. This is a case where the living room has the short end to the street, as opposed to the long side to the street - which only allows one room to the street. This allows a bedroom to share the orientation of the living room to the street, and may make the overall depth of the building somewhat shorter.
There is also a typical variation on the storied Chicago window, with a wider, operable window in the center of the three window unit. This building has luckily retained it's original mullion patterns as well.
I am going to leave it here for tonight; tomorrow or the next day, I will get into
Needless to say there are many more front treatments and typologies to be explored. The sunroom has huge numbers of wonderful examples, and then there are the custom and higher end buildings, with classical, architect designed features which evolved into the few, but not, luckily, too rare art deco buildings which can be found here and there.