Perhaps I missed discussion about it, but I haven't seen this before.
On various searches with a city and state included some of the results will show under the result URL:
25+ Items - Followed by normal site snippet
Address # 1 City, State More Information
Address # 2 City, State More Information
Address # 3 City, State More Information
Always has 3 sub-pages, but I've seen the "25+" be 10+ or 100+
Real estate and legal based searches and it only shows sporadically through SERPS