The first problem is that, Christ was not crucified during the 70th week, but at the end of the 69th week, i.e. week of years.
The seventy seven year periods are divided into three sections, as follows:
Seven 7 year periods = Restore and rebuild Jerusalem
Sixty two 7 year periods = totaling sixty nine seven year periods, which at the end of the Messiah was crucified
One seven year period = the fulfillment of the seventieth seven year period, which will be initiated by the prince to come
Below is how the scripture is stated:
"Then after the sixty-two weeks, the Messiah will be cut off and will have nothing"
7 x 7 = 49 years
62 x 7 = 434 years
Total = 69 sevens or 483 years at the end of which the Messiah was cut off
The last seven is years is described as follows:
"And he will confirm a covenant with many for one week, but in the middle of the week he will put an end to sacrifice and offering. And on the wing of the temple will come the abomination that causes desolation, until the decreed destruction is poured out upon him.”
The first thing to take notice of is who is the "he" referring to in verse above. Grammatically speaking, we have to go back to the last person who was mentioned, which "the prince of the people" found in verse 26. This is not Jesus, but that ruler, the antichrist who is to come.
Secondly, none of the prophesies of verse 27 have been fulfilled, as revealed below:
From the time that Jesus quoted Daniel 9:27 in Matt.24:15, there was approximately 37 years, give or take a few years until the temple was destroyed. During that time no seven year period was initiated, the sacrifices and offerings were not stopped until the temple was destroyed. No desolation of Israel has occurred where they flee from Judea to the mountains where God is to care for them for 1260 days, which by the way comes to its completion when Christ returns to the earth to end the age.
And thirdly, the last part of verse 27 says, "until the decreed destruction is poured out upon him,” which is referring to when that prince, the antichrist, is cast into the lake of fire when Christ returns to the earth to end the age, as described in Rev.19:20. Paul spoke about the same person and his destruction when he said:
"And then the lawless one will be revealed, whom the Lord Jesus will slay with the breath of His mouth and abolish by the majesty of His arrival" - 2 Thess.2:8
And one of the biggest problems that you and others have with your interpretation is the following:
"Seventy weeks
c are decreed for your people and your holy city
to stop their transgression, to put an end to sin, to make atonement for iniquity, to bring in everlasting righteousness, to seal up vision and prophecy, and to anoint the Most Holy Place.
None of the above emboldened in black has been fulfilled, as up till this day the nation Israel does not recognize Jesus as their messiah and therefore are still in their sins. Everlasting righteousness has not been fulfilled, vision and prophesies have not been sealed up, i.e. there has not been an end made to them., as there are yet many prophesies yet to be fulfilled. And lastly, the "Most Holy Place," i.e. the holy of holies, which was that inner room that only the high priest as allowed to enter and that only once a year and not without blood, has not existed since the destruction of the temple. Therefore, what is in view here, is the millennial temple which will be erected during at the beginning of Christ's thousand year kingdom and which is described in detail in Ezekiel chapters 40-48.
You and others hold to this interpretation that the entire seventy seven year periods have already taken place and that because you cannot conceive of God putting a hold on the last seven years in order to meet its fulfillment in conjunction with the time of His wrath and the Lord's return to the earth to end the age. Yet, we have other scriptures that demonstrate prophecies with time gaps in their fulfillment.
After the Messiah was cut off, i.e. crucified at the end of the 69th seven, God put a hold on the last seven and began to build the church, which is still in the process of being built. Once the church has been completed, in fulfillment of John 14:1-3 and 1 Thess.4:13-17, the Lord will descend and gather the church, dead and living, taking us back to the Father's house to those places that He prepared for us. Once the church has been removed, the shortly afterwards, God will pick up right where He left off with Israel, where that prince, the antichrist will establish his seven year covenant with the many, which will allow Israel to build her temple. During which time God will be pouring out His wrath upon a Christ rejecting world via the seals, trumpets and bowl judgments. And we all know that in the middle of the seven that antichrist will cause the sacrifices and offerings that Israel will have been making to cease and will set up that abomination in the holy place within the temple.
That is the truth of that last seven year period, which is coming quickly.