Engineering questions - steel laminate beams

[Jim Timber]

So imagine this is my shop, only the middle is roughly twice as wide, and a bit taller on both levels.

 

[ishiboo]

joe - if you don't mind, can you get me the size of the beam? I have to span 21' or so just as you did, except the span on each side will be right around 17' instead of 14'. I plan on doing it in the same manner as yours was done. Each end will bolted with steel plates to a 10"x10" oak post.