The Takagi Building.- High Points
In the takagi building after coming back out of thekitchen and talking with the girl in the freezer...head towards the elevator again and down the stairs where you saw Takagi run up them to go upstairs. Wait by the side killing yakuza until the green yakuza commando comes down and grab him, using him as a shield.
The other Yakuza will continue to respawn. Kill them as they come down the stairs for infinite points. As long as you've got the green commando as a shield he won't respawn. If your shield gets killed take out the other yakuza until the commando respawns and grab him as a shield again. Be careful if you want to interrogate if your not quick enough or pick bad timing the respawning yakuza will shoot you screwing up your "score multiplier".
When you get all the points you want head up the stairs and kill the 3 white commando's that pop out of the elevator.