By this description, it is known that Sakamoto-jo Castle had a tenshu (main keep or tower of a castle), and it is considered that the construction of a tenshu was well under way by January 1573 after the construction of the Castle started.
このことから坂本城には天守があり、作事が行われ翌12月頃には天守がかなり進捗していたと思われている。