Ward St was a cluster of houses in a few block radius centered on a block on Ward St, Berkeley. It was at least partly encouraged by Katja Grace (here) and Scott Alexander (here) blogging about it.

• There were about seven houses at some point.
• There was little inter-house intermingling to Katja's knowledge
• Houses contained fairly different people and vibes, and many people didn't necessarily know people at other houses that well

• Something like this probably benefits a lot from one common area that everyone feels comfortable going to, with other plausible reasons to be there (e.g. coffee, cereal), like a dorm dining hall
• Neighborhoods are trickier than houses because original members have no control over who joins