Along the sidewalk in front of Seinenkan Hall, there are many benches and chairs. There is a FamilyMart nearby.
The Nippon Seinenkan is a multi-purpose complex that includes a hall, a hotel, and conference rooms, and it is a historical facility that opened in 1925.
Due to the relocation for the acquisition of land for the 2020 Tokyo Olympics, it opened in the summer of 2017 in front of Meiji Jingu Stadium.
A Word from Pen-ta
So, why not use it as a place to take a break around Gaienmae?

