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Multi-unit buildings, such as Chicago's famous two-flats, are integral to urban landscapes across the United States, representing a significant portion of residential structures. In fact, approximately one quarter of Chicago's population resides in these types of dwellings or their three-tiered counterparts. However, variations of these buildings exist throughout the country—in places like Boston and San Francisco—each reflecting the unique architectural styles and societal needs of their respective cities. With growing awareness of the importance of such structures in promoting home ownership, building equity, and fostering vibrant communities, understanding their distinctive features has become crucial, particularly as urban centers face escalating housing challenges.