Ikegami Honmonji Temple
The structures themselves appear to have been recently renovated, so has a very "new" look.
Great photos, virtual tours and event info. in Japanese, and one page of history in English:
Get there from East Side Kawasaki Station Bus Station #10, the Gotanda-bound bus and get off at "Honmonji-ura" Bus Stop, 10 min. walk.
Alternatively, 10 min. walk from either Toei Asakuka Line "Nishi Magome" Station, or Tokyu Ikegami Line "Ikegami" Station.