After returning along the street to get the motorcycle and driving it back to the gate where you began the level, drive through the gate and around the corner.

Drive off the edge into the large, shallow pit.

Continue into the building, ride down the stairs, and follow the ledge around to the right.

Run over another soldier at the bottom (or dismount near the top of the stairs and shoot him).

Crawl into the low opening on the east wall to get some poisoned arrows.

Now ride the motorcycle all the way up the stairs to the top level.

Here you'll find a small ramp jutting out toward the middle of the room. Drive into the room to the right of the ramp.

Make a U-turn to the right, taking care not to drive off the edge.

NOTE: The wide opening on the right leads back down to the street. There's no need to go there yet, but if you accidentally drive off the edge, just follow the street back to the gate at the start. Then drive up the stairs again.

Use the ramp to jump the bike...

...into the opening on the opposite wall.

After landing the jump, get off the bike near the first lit torch and walk up the ramp to the second lit torch.

Climb/jump into the alcove on the left.

Kill a couple of bats roosting inside. Then and pull the lever.

This raises a block downstairs.

Get back on the motorcycle and ride up the steep ramp near the second torch...

...and down the other side...

...to get back to the stairway. Down on the next landing you'll see the block you just raised.

Dismount and climb onto the block. Turn right, and pull up into the passage above.

Continue to an opening overlooking the DEAD-END ALLEY WITH THE BLOCK AND CRAWLSPACE.

[City of the Dead Walkthrough]