Multi horse pens are as follows, Upper existing pens 220' X 40' and lower existing pens 161' X 40'. We also have a couple 3 horse pens and one of them measured out at 151' X 110' and our newly constructed lower pens 266' X 80' at its widest point in the back are a little different in dimensions from each other but they average out to nearly the same square footage. There are a couple of other odd shaped pens that have not been measured out.