Unmodified Building Payouts:
1. 1,942
2. 3,884
3. 5,826
4. 9,710
5. 13,594
6. 19,420
7. 25,246
8. 31,072
9. 40,782
10. 58,260
For reference, the Unmodified Lender at Level 10 pays out 60,000 and has the same collection time. This building is basically just another Lender only much, much more expensive to upgrade.
Unmodified Upgrade Costs:
1. 200,000
2. 260,000
3. 364,000
4. 546,000
5. 873,600
6. 1,485,120
7. 2,673,216
8. 5,079,110
9. 10,158,221
10. 21,332,264
Total: 42,971,531
Upgrade Cost Reduction bonuses aren't being applied properly, so YMMV.