My understanding is that the Temple is not to be rebuilt until Moshiach comes.
A temple has to be built during the reign of Antichrist because the Bible says he will enter the Temple and desecrate it by placing an image of himself in the Holy of Holies, and is referred to as the "Abomination of Desolation".
http://www.jewfaq.org/moshiach.htm :
...the Torah contains several references to "the End of Days" (achareet ha-yameem), which is the time of the moshiach; thus, the concept of moshiach was known in the most ancient times.
The term "moshiach" literally means "the anointed one," and refers to the ancient practice of anointing kings with oil when they took the throne. The moshiach is the one who will be anointed as king in the End of Days.
The word "moshiach" does not mean "savior." The notion of an innocent, divine or semi-divine being who will sacrifice himself to save us from the consequences of our own sins is a purely Christian concept that has no basis in Jewish thought.
And guess what ?
He just may be here right now, alive and breathing on Planet Earth doing his work.