Properties are what you can build on the Undeveloped Space to attain more income. Only certain properties can be built in certain places.
Properties
Lou's Deli
Cost: Given to you in the beginning of the game
Income: $250 per hour
Built On: N/A
Mafia Mike's
Cost: $8,000 (First purchase costs 3 Mafia Members. Each additional purchase costs 2 more Mafia Members each time.)
Income: $12,000
Built On: Abandoned Lot
Rent House
Cost: $10,000
Income: $300 per hour
Built On: Abandoned Lot
Italian Restaurant
Cost: $30,000
Income: $700 per hour
Built On: Abandoned Lot
Apartment Complex
Cost: $200,000
Income: $5,000 per hour
Built On: Commercial Block
Valu-Mart
Cost: $400,000
Income: $10,000 per hour
Built On: Commercial Block
Marina Tourist Shops
Cost: $5,000,000
Income: $50,000 per hour
Built On: Beachfront Property
Office Building
Cost: $16,000,000
Income: $150,000 per hour
Built On: Prime Downtown Lot
5-Star Hotel
Cost: $20,000,000
Income: $200,000 per hour
Built On: Beachfront Property
Mega Casino
Cost: $40,000,000
Income: $300,000
Built On: Prime Downtown Lot