Just Cause

Takeover missions are where you are capturing the Montano drug gang's villas and turning them over to your Rioja gang allies. Montano houses are marked on the map as purple houses. After you have captured them, they will be yellow.
Unlike towns, cities, and military bases, Montano villas can be taken over even if the province is not "politically unstable".
Like a town, the takeover consists of three sets of "kill the henchmen, then blow up the barricade", followed by kill the local gang boss. The henchmen are relatively easy to kill, and drop ample supplies of grenades.
Each villa has an unarmed helicopter on the roof, which can be quite convenient afterward.