The ancient city of Tyre does not exist. It has never been rebuilt. It's ruins still stand today. Another city of Tyre was built near those ruins, but the original city, is still in ruins.
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"The modern city of Tyre is of modest size and is near the ancient site, though not identical to it. Archaeological photographs of the ancient site show ruins from ancient Tyre scattered over many acres of land. No city has been rebuilt over these ruins, however, in fulfillment of this prophecy." (Dennis and Grudem, “Tyre,” The ESV Study Bible)
"In point of fact, the mainland city of Tyre later was rebuilt and assumed some of its former importance during the Hellenistic period. But as for the island city, it apparently sank below the surface of the Mediterranean…All that remains of it is a series of black reefs offshore from Tyre, which surely could not have been there in the first and second millennia b.c., since they pose such a threat to navigation. The promontory that now juts out from the coastline probably was washed up along the barrier of Alexander’s causeway, but the island itself broke off and sank away when the subsidence took place; and we have no evidence at all that it ever was built up again after Alexander’s terrible act of vengeance. In the light of these data, then, the predictions of chapter 26, improbable though they must have seemed in Ezekiel’s time, were duly fulfilled to the letter—first by Nebuchadnezzar in the sixth century, and then by Alexander in the fourth." (Archer, “Tyre,” Encyclopedia of Bible Difficulties)