The Dairy Farm is one of 8 production buildings in the game.
There are no build radius limits, so you can line them up side by side.

You can buy this building in the shop for superbucks under Production tab

Once again, you can't make the items ahead of time to put into inventory the items are only used when you have a quest asking for them.

However, this is a great place to make goods, simply look at the items to see how many goods you can get for each item.