Actually buildings in historic districts dont deserve their own articles unless theyre notable for other reasons  The district itself is notable and of course those buildings can be notable but they arent necessarily  A much better idea would be your second suggestion because having some good details on the various buildings in the district would be quite useful and far better than having a tiny district article such as this one  As far as the thematic groups now called Multiple Property Submissions if I remember rightly ask Doncram who has done work on these  After researching the issue he came to the conclusion that theyre not necessarily notable per s but having an article on the group and redirecting the various property articles to it would surely not be problematic