The temple in Lehi-Nephi is obviously different than the temple of Zarahemla where Benjamin delivered his sermon. The Book of Mormon records two other temples, the temple in the land of Nephi (2 Nephi 5:16) and the temple in Bountiful (3 Nephi 11:1). It is possible that the temple spoken of in this verse is the same temple that Nephi built (2 Nephi 5:16). However, that temple would have been about 450 years old.