Business 23
Takeover the business to the north-west of Business #21.
Balloon 70
The apartment block just north of Business #23 has a double set of staircases leading up to the top floor. The balloon is at the top of the west set of stairs.
70-balloon reward: You'll now be able to pick up a flamethrower from any of your safehouses.
Balloon 71
Go east onto the main road then take the next left and then left again by the R*Lax poster into an enclosure. Go to the south-west corner of the enclosure and look up to the east. The balloon is under the roof.
Balloon 72
Go north from the R*Lax poster into the enclosure. The balloon is in a tree in the north-west corner.
Next: MENDEZ BROTHERS 3: Unfriendly Competition (Includes Balloon 73)