The question is about a practice facility, not a stadium.
As a General Contractor that owns a private Baseball team and has built numerous "sports structures" such as batting cages, Fencing, dugouts, etc. - my best shot from the hip would be around 875K for the buildings, cement work, infrastructure, and planning. Land costs and development expenses are a whole other issue and planning commissions may want the surrounding area to be improved or have you fit the bill for public safety items like street lights , sidewalks, and road construction.
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