Glencoe was built out largely between 1915 and 1940 in Tudor and Colonial Revival, on large wooded lots, many on or near a ravine. The houses are substantial and were planned with a clear separation between the rooms the family used and the rooms the household ran on.
That separation is still there. A typical original plan puts the kitchen at the rear behind a butler’s pantry, with a service stair, a rear hall, sometimes a maid’s room and a back porch all stacked around it. Individually each space is too small to be useful now. Together they are frequently larger than a modern kitchen and family room combined.
The work is a combining exercise, and it is structural. Walls between the service rooms are often non-structural and come out easily. The wall separating that whole zone from the dining room usually carries the floor above and needs a sized beam and an engineer’s letter. Which walls do what is established with a ceiling open, and it is the difference between the two bands above.