Located near Kamakura station, but Sanmon is located on the Myohon-ji side, opposite side from the station.
There was an Ebisu-do at the place around the current Sanmon, and Nichiren stayed there. Later, Nisshutsu established Hongaku-ji based on Ebisu-do.
Every current building is relatively new. The oldest one is the Sanmon, which was built in the Edo era.