Example. One station I have was bought for 100K.
It has 8 bays.
1 - Free from the start
2 - 10K
3 - 50K
4 - 100K or 20 Coins
5 - 100K or 20 Coins
6 - 100K or 20 Coins
7 - 100K or 20 Coins
8 - 100K or 20 Coins
Total cost for Fire Station = 660K
Now, If I were to sell the units along with it as a wholesale,
Battalion Command - 10K
Battalion Command - 10K
Rescue Engine - 19K
Rescue Engine - 19
Type 2 Engine - 5K
Quint - 19K
Tanker - 17,300K
Mobile Air - 11,680K
Total cost on Units = 110,980K
Now to add the Fire Station and Units all together would come to = 770,980K
Which would make the buyer already set with a complete fire station and bays with units of the buyer so desires to keep them and the seller rich.