Park Ridge has two housing stocks sitting side by side. Around Uptown and the Country Club district the houses are 1920s and 1930s Colonials, Tudors and Chicago-style bungalows, with the kitchen at the rear behind a pantry or beside a back porch. West and south it is 1950s and 1960s ranches and split-levels, with a closed kitchen and a ring of dropped soffits.
The difference is structural and it is the whole cost story. In a 1928 Colonial the wall between the kitchen and the dining room is usually carrying the floor above, so opening it needs a sized beam and an engineer. In a 1958 ranch the equivalent wall is usually a partition that comes out in a day.
The second difference is underfoot. The pre-war houses have a basement with a usable ceiling, so a sink can move to an island at proper fall. The post-war ranches have the waste cast into a slab, where it cannot. We establish both before drawing anything, because together they decide what is worth spending money on.