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Do you want a shallow steel beam with the same supports or do you want to remove supports?
Is there any ceramic tile?
So you want the beam to clear span 25'?
And the floor is going to be concrete?
The lowest profile you will get will be a steel I beam. A flitch plate beam will be much heavier and less efficient.
An LVL works well, but it will be VERY deep to span 25'
Supporting just a single floor, you will need a 5.25" x 18" 2.2E LVL to just barely work for L/240 total load deflection.
A steel beam would be a W10x39 or W12x30. The first is 10" deep and the second is 12" deep. The steel beams require the joists to be detailed to brace the beam against lateral torsional buckling.
Very deep is the 18" I listed in the size immediately following that sentence.
Oh, it's supporting two floors, not just the one? That will require a bigger beam.
You will need a 7" x 24" 1.8E LVL to limit total load deflection to L/240 supporting the two floors and a non-storage attic.
A steel beam would be a W14x43 (14" deep and 43 pounds per foot). This will need the joists to brace the beam against lateral torsional buckling.
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