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I'd say its a bit more complex because A) many rowhouses have been modified at various points(the addition of mansard roofs to pre-1850 buildings for example is not unknown, for instance) and B) it's the case that buildings appear in pairs, or in closely duplicated patterns or rows, or in occasional cases that part of a row is built at different times or a lot is subdivided and sold to different buyers, or that a originally full-block row is partially restored or replaced).