The destruction of the temple was NOT specifically confined within the 70 weeks. All the destruction and desolation are determiend in the aftermath of the messiah's sacrifice. 9:26 and 9:27 are talking about the same final week of years, in which the Messiah will end the animal sacrificial system by offering himself as the ultimate sacrifice, after that Israel was given 40 years for repentence, then the sacking of Jerusalem, destruction of the temple, and the temple hill remains "desolate" with the abomination of the mosque, and it will stay that way till the end of time.
But when you see Jerusalem surrounded by armies, then know that its desolation is near ... and they will fall by the edge of the sword, and be led away captive into all nations. And Jerusalem will be trampled by Gentiles until the times of the Gentiles are fulfilled. (Lk. 21:20-24)
Here are the verses.
As we see, the first 69 weeks ended with the term “Messiah the Prince”
After this comes verse 26 and the two distinct events:
Messiah cut off
City and temple destroyed.
We are at 70 AD and the final week hasn’t begun yet. The final week doesn’t begin until the next verse.
Daniel 9:25-27
“Know therefore and understand,
That from the going forth of the command
To restore and build Jerusalem
Until Messiah the Prince,
There shall be
seven weeks and
sixty-two weeks;
The street shall be built again, and the wall, Even in troublesome times. V. 25
“And after the sixty-two weeks
Messiah shall be cut off, but not for Himself;
And the people of the prince who is to come
Shall destroy the city and the sanctuary.
The end of it shall be with a flood,
And till the end of the war desolations are determined.
v. 26
Notice in verse 26 we have two distinct events that we can assign time markers to.
Messiah cut off - 33 AD
City and sanctuary destroyed 70 AD
Yet the 70th week hasn’t yet begun.
Then he shall confirm a covenant with many for
one week;
But in the middle of the week
He shall bring an end to sacrifice and offering.
And on the wing of abominations shall be one who makes desolate,
Even until the consummation, which is determined, Is poured out on the desolate.” V.27