"He caused a tower to be" erected/built

1. Mosiah 2: 7
   7 For the multitude being so great that king Benjamin could not teach them all within the walls of the temple, therefore he caused a tower to be erected, that thereby his people might hear the words which he should speak unto them.
2. Mosiah 11: 13
   13 And it came to pass that he caused many buildings to be built in the land Shilom; and he caused a great tower to be built on the hill north of the land Shilom, which had been a resort for the children of Nephi at the time they fled out of the land; and thus he did do with the riches which he obtained by the taxation of his people.