GMAT Sentence Correction (SC) | A 2009 study from the California State Housing

Good question!

A 2009 study from the California State Housing Authority concluded that conversion from ownership to rental properties has often beendifficult; it has been more common for some townhouses and other “attached” homes that are relatively small and old, located in central cities.

(A) difficult; it has been more common for some townhouses and other “attached” homes that are relatively small and old,located in central cities.
Wrong. - Must have "and quot; before "located".
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