Ran across this in a condo conversion. The panel (such as it is) and main disconnect(s) were located in the basement and supplied a one bedroom (with living room. den and kitchen) condo. The two breakers were 1 15 amp and 1 20 amp only.
Called it out as insufficient service for the unit. ‘Developer’ said it was code. Explained to client that he would not be able to serve his fridge, disposer, microwave, ‘kegger’ mini fridge, large screen TV, computer, stereo, 2 (count 'em) window A/C units and all the other stuff in his unit with only one 15 amp branch and one 20 amp branch.