Once You have completed The Tommy Vercetti Crime Ring Mission "Copland", you will no longer be able to do missions at your house. To Unlock them, you DON'T have to complete all the "Extra" missions (eg. Avery Carrington, Cubans, Haitans, Love Fist etc.) Here's how you do it:
Once you have completed the "Shakedown" mission, a whole load of "Asset" properties will come available. The Asset properties are:
The Malibu, The Pole Position, The Film Studio, The Boatyard, The Ice Cream Factory, The Print Works, Kauffman Cabs, and Sunshine Auto's. All of these (once you have done certain tasks), will generate money everyday. You must aquire SIXTY PERCENT of these properties. Meaning you must get AT LEAST 5 of them. The ones you MUST buy are the Print Works, and The Malibu.
Once you have bought 60 percent of them, and completed a few specific extra missions, you'll will get called by the print factory. The final missions begin.
Note: If you buy 60% of the asset properties (including the Malibu and Print Works), and you don't get called, it means you must complete more of the EXTRA missions. These are the ones where you work for less-important people in the game. To give you a hand, these are the MAIN STORY EMPLOYERS. They are the ones who are not included in the EXTRA category
1. Ken Rosengurg
2. The Colonel, Juan Garcia Cortez
3. Ricardo Diaz
4. Tommy Vercetti Crime Ring Missions (Mansion Missions)
5. The Malibu Missions
6. The Print Works Missions