| Picture | Name | Cost | XP | Unmodified Earnings | Rate | Size | Build Time |
|---|---|---|---|---|---|---|---|
|
Marine Turbine | 15,200 
|
152 | 150
|
15 min | 3x3 | 4h 3m |
|
Abyss Museum | 30,000
|
300 | 550
|
1 hr | 4x4 | 8h 0m |
|
Security Complex | 20,250
|
203 | 399
|
45 min | 2x2 | 5h 24m |
|
Observation Deck | 19 
|
1,000
|
2 hr | 4x4 | ||
|
Megalodon Diner | 25,350
|
254 | 200
|
30 min | 3x3 | 6h 46m |
|
Sonar Station | 29
|
2,200
|
4 hr | 2x2 | ||
|
Repair Bay | 13,500
|
135 | 570
|
1 hr | 2x2 | 3h 36m |
|
Pangaea Shopping Mall | 49
|
6,000
|
12 hr | 5x5 | ||
|
Security Office | 15,750
|
158 | 560
|
1 hr | 2x2 | 4h 12m |
|
Gondwana Theater | 39
|
5,000
|
10 hr | 3x3 | ||
|
Thermal Vent Power | 18,750
|
188 | 900
|
2 hr | 2x2 | 5h 0m |
|
Infirmary(Lv.27) | 19,500
|
195 | 950
|
2 hr | 2x2 | 5h 12m |
|
Underwater Condo Complex | 84,000
|
840 | 1,500
|
3 hr | 4x4 | 22h 24m |
|
Jellyfish Kingdom | 59
|
5,598
|
9 hr | 4x4 | ||
|
The Tethys | 52,350
|
524 | 1,200
|
2 hr | 3x3 | 13h 58m |
|
Vet Office | 154,700
|
1547 | 4,992
|
12 hr | 5x5 | 41h 15m |
|
Underwater Cave Ride | 154,700
|
1547 | 9,984
|
24 hr | 5x5 | 41h 15m |
|
Botanic Garden | 99
|
9,792
|
18 hr | 4x4 | ||
|
Disco | 89
|
7,995
|
15 hr | 4x4 | ||
|
Hotel | 256,500
|
2565 | 7,888
|
16 hr | 6x6 | 68h 24m |
Notes[]
Build time can be calculated from the Cost. For buildings that must be purchased with coins, divide the cost by 62.5 and round down to get the build time in minutes. Ex: Marine Turbine 15,200 / 62.5 = 243.2 ==> 4h 3m
Analysis[]
Deciding the best return on your investment depends a bit on how often you collect. If you are collecting once a day (or less), the Underwater Cave Ride has the best Cost/Earnings ratio (it pays for itself in 15.5 collections. However, since it takes 24 hours to reach full earnings, the Infirmary is a better choice if you routinely collect more often.
The Marine Turbine and The Tethys have the best Earnings/hr. The Repair Bay is almost as good and has a very good Cost/Earnings ratio.