The table (community-reported unless marked official)

Official screenshot © thogli studios — a stage-2 stable in the demo.
| Building | Stage 1 | Stage 2 | Stage 3 | Stage 4 | Unlocks |
|---|---|---|---|---|---|
| Stable | included, 4 horses, 10/day | 2,500, 8 horses, 30/day, 2 days | 10,000, 14 horses, 80/day, 3 days | 50,000, 20 horses (official), 200/day, 4 days | One more stable group per stage |
| Pasture | 200, 5/day | 1,000, 10/day | 5,000, 20/day | 10,000, 50/day | No capacity; keep level ≥ stable or some groups have no field |
| Main house | included, 5/day | 5,000, 50/day, 2 days | 20,000, 200/day, 4 days | — | Staff: Laura & Maria → Fiete, Julia, Tara, Bianca → Lucas, Meilin, Markus |
| Breeding station | 1,500, 15/day | 5,000, 40/day | 15,000, 100/day | — | Natural cover → fresh semen + foal simulator → frozen semen |
| Parking lot | 200, 5/day, 2 trailer slots | 500, 4 slots | 1,500, 10 slots | — | Trips to town; slots = horses per day |
| Riding arena | 500 (day-0 quest) | 5,000, 20/day | 10,000, 100/day | — | Courses: see training |
| Yearling paddock | 1,500, 6 slots | 10,000, 13 slots (official) | — | — | Where foals grow up |
| Feed storage | hay/grain/treats 30/30/30 | 65/70/40 | —/150/50 | ? | Capacity only |
Upkeep is per in-game day and starts the moment the upgrade finishes — the reason the money page says don’t outrun your income. Backgrounds of the care screen, arena and breeding station change with each stage (official).