Case: High-Rise

$N$ pinned between $2$ clues

When we have the $N$ skysfraper pinned between clues of $2$ at both ends of the lane, we know 1 end must have the $N-1$ skyscraper immediately in front of of the $2$ clue.




2	5	2

The 2 possibilities are:




2	4	5	2




2	5	4	2

The $N-1$ must go directly in front of a $2$ clue as deduced from Blockade.