premise: Various sophisticated-looking urban types stroll down the avenue of a vintage-looking area, complete with street lamps. hypothesis: People in sophisticated clothing are walking through an area that appears to be styled in a vintage sense.
entailment: Sophisticated looking urban types is a rephrasing of "people in sophisticated clothing." In both cases, these people walk (which is the same as stroll) in a "vintage-looking area" which is a rephrasing of "area that appears to be styled in a vintage sense.".