function OnMsg.ClassesPostprocess()
    local p = BuildingTemplates.ConcretePlant
    -- remove sponsor limit
    p.sponsor_name1 = false
    p.sponsor_status1 = false

    p.consumption_resource_type = "Concrete"
    -- if you want to change them
    p.consumption_amount = 200
    -- output
    p.resource_produced1 = "PreciousMetals"
    p.production_per_day1 = 30000
    -- remove wasterock
    p.resource_produced2 = false
    p.stockpile_class2 = false
end