To get to the deck in front of Shinagawa Station, go from the central JR ticket gate toward the Konan Exit, where Atre and the Tokaido Shinkansen are located, and you'll find the deck after a short walk.
You'll also find places to sit and rest on the decks on both sides, towards the Tokyo Conference Center and Shinagawa Intercity.
Single-person stone benches are lined up here.
Perhaps because Shinagawa's salarymen prefer the shortest routes, this area is surprisingly empty, as if repelled by magnetic force.
Since people are walking in droves toward the arcade side, it's a surprisingly easy spot to take a break, even though it's right in front of Shinagawa Station.
Speaking of which, it's right in front of Shinagawa Station.
Isn't it a pretty easy place to meet up?
I think it's convenient for business trips and meetings in Shinagawa!
(Pen-ta has used it too!)
Also, I recommend "Table seats on the 2nd floor of Shinagawa Front Building" where you can work at a desk around Shinagawa, and also "Sofa seats in front of the Nikon Museum in Intercity C Building" where you can rest in a quiet space, so please consider those as well.
So, why not use this place as a resting spot with seating around Shinagawa Station?