Just had a quote done for my 10,000 sq ft of driveway and parking area and it was right at $70k. That is $7/sq ft for concrete poured with almost no grade work. They just have to remove 2500 sq ft of asphalt and regrade the area for drainage and then grade the driveway area, set the forms and pour. All I asked for is a lightly brushed finish so they wouldn't have to trowel the surface. That seems a little high - about the same price - $7/sq ft as the 6" insulated floor and foundation for my steel building that I put up in 2016. Seems like a driveway should be a lot lower cost than an insulated floor and foundation which included large chunks of concrete for each of the metal support pillars.