In order to procede from where you are: 1. Complete all vercetti missions (at the mansion)-- the last being copland-- the mansion will generate money like an asset. 2. Complete the printworks asset-- it will generate money. 3. Complete any 5 other assets (so they generate money).
List of assets:
Vercetti Estate -¹ Starfish Island $5,000 Boatyard $10,000 Viceport, Vice City Mainland $2,000 Cherry Popper Ice Cream Factory $20,000 Little Havana, Vice City Mainland $3,000 The Pole Position Club $30,000 Ocean Beach, Vice Beach $4,000 Kaufman Cabs $40,000 Little Haiti, Vice City Mainland $5,000 Sunshine Autos $50,000 Little Havana, Vice City Mainland $1,500-$9,000 InterGlobal Films $60,000 Prawn Island, Vice Beach $7,000 Print Works $70,000 Little Haiti, Vice City Mainland $8,000 Malibu Club $120,000 Vice Point, Vice Beach $10,000 Phil's Place -² Little Haiti, Vice City Mainland Weapons for sale
¹ Tommy Vercetti takes over Diaz's Mansion and renamed it Vercetti Estate after the mission Rub Out.
² Phil Cassidy's missions are unlocked after the mission The Job.