The place I purchased was 5 acres. The hen house is a 65x65 foot equipment shed that was converted to hold 2500 floor-raised layers. In addition to the building there is about a 1/3 of acre of pasture set aside for the birds. In good weather several overhead doors are wide open and the birds are allowed in and out as they wish. They have been running on this same pasture for about 4 years and we are planning on expanding the pasture and rotating them to another area next year. About 3 out that 5 acres is now in grain crops planted as part of a 20 acre field.
That alone is not very sustainable though. An organic system would include the cropland required to grow the feed for the birds and to spread their manure. The 5 acres I bought was part of a 34 acre plat with about 20 acres in organic grains. The fellow I bought it from grew a large portion of the hens' organic feed there and spread the manure there. Due to certain circumstances he wanted to sell the home and barns, but keep the rest of the plat. He will continue to grow organic grains and spread the manure from the layer operation we now own.
Those 2500 hens will lay close to 60,000 dozen eggs a year, grossing $110,000 in eggs. I am hoping to make at least $20,000 a year in profit.
Regardless of the aversion here to "commercial" laying operations, this country still needs farms to feed it's people. Many lament the loss of family farms, yet will sneer at those who have a dream of making a living this way. I went off on a gal in another thread the other day who made snide comments about the "large farm down the road" and how they supposedly treated their laying flock. This was a place that sounded like a large family farm to me. She said they raised their hens cage-free , yet she was convinced they were somehow evil because they had large buildings, were trying to make a profit, and didn't raise their hens like she raised her small flock in her backyard.
So far, I consider this small organic operation I have purchased to be a fine example of an alternative production model for commercial hens. Perhaps we could educate the original poster on such options instead of running him off...