Answer:
Monthly Rent = 92825.46
Step-by-step explanation:

Total investment 6,000,000
Income per year: X
rate of return 0.009489 per month
time 25 years x 12 months = 300
We will solve for the monthly income of the project.

This should be the net income per month $60,492.12803
Now well do the monthly income statment to solve for rent:
Rent + Aprreciation of land - Property tax - maintenance = net income
Rent + 1,200,000 x 0.05/12 - 400,000/12 - 100 x 40 = 60492.13
Rent = 60492.13 - 5000 + 33333.33 + 4,000 = 92825.46