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The Heist
The safest way to enter the building is to go down the top-left ladder and wait on top of the short ladder to the right. As an enemy approaches, run over him to the pole. Now go right and fall onto the balcony, then dig out and fall.
Run into the lobby and up the ladder sculpture to get gold. Fall off to the left onto the concrete block and wait for the enemies to bunch up. Fall left and run back outside to the concrete outcropping with the enemies following. Use the same ladder and pole to get back in. 
Run to the very top of the building up the rightmost ladders. Stand at the leftmost point of the roof. Wait for an enemy to fall below you, then step back, dig and fall after him to the balcony, where you can collect three gold pieces. If you wait long enough on the roof before falling you can persuade several enemies to follow and become trapped on the balcony.
Use the ladders on the right to collect the remaining gold and exit.
