We must remember that the disciples asked Christ two questions.
1. When will the temple be destroyed?
2. What will be the sign of your coming and the end of the age?
The arguments always come up when discussing which verse changes from the first question to the second question.
In Luke's Gospel there seems to be a change between Luke 21:24 and Luke 21:25.
Luk 21:24 And they shall fall by the edge of the sword, and shall be led away captive into all nations: and Jerusalem shall be trodden down of the Gentiles, until the times of the Gentiles be fulfilled.
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Luk 21:25 And there shall be signs in the sun, and in the moon, and in the stars; and upon the earth distress of nations, with perplexity; the sea and the waves roaring;
This would be the point where the discussion changes from the events that happened in 70 AD to the events of the 2nd Coming, which are in the future.
This makes me a partial futurist.
If we apply this logic to Matthew's Gospel, it means verses 24:29 and after are referring to the Second Coming. In my opinion all of those things will happen on the last day of the trib. (The last day of John chapter 6)
If you are going to ask me to explain the word "immediately". I cannot give any certain answer, however remember that the word "tribulation" does not necessarily mean the end-time tribulation period. Those in the city of Jerusalem most certainly underwent tremendous tribulation during the siege of 70 AD. Also, the Apostles underwent tribulation and most of them became martyrs. Some believe the Church has been under tribulation from persecution since it began.
I do not claim to have all of the answers. In some cases the text is clear and in others we may never know until we get there. At that point you can tell me I was wrong, if that is the case. I do not think either of us will care at that point.