Thanks for the input. I did a rough calculation. Each court costs about 50-60K to build, thus a 5 court center costs about 300K. the bubble cost about 150K (?), that makes the total = 450K. the lot should be 3 acres. that's another 700K-1 mil in our area. so the total will be 1.2 -1.5mil.
Income (per court): 14 hrs/day (8am-10pm) X$40/hr = $560/day or 560 x 30 = $16,800/month
5 courts income in a month =16800 x 5 = $84000
5 courts income in 6 block-time months 84000 x 6 =$504,000
5 courts income in other months $100,000
Grand total $604,000
cost: utilities $30,000/court 5 courts = $150,000
labor 2 x $25000 = $50,000
Total $200,000
Other costs $4,000
Grand total $204,000
Income in a year 504,000-204,000 = $ 300,000
which means we might be able to get the investment back in 5 years