Are there restrictions on columns or bracing ( vertically angled members) going through these spaces? as they are not horizontal beams. Addtionally, are vertically angled bracing members permitted, if they cut into the rentable floor area, given that this loss is accounted for in building calculations.

There’s no restrictions, but keep in mind that you have to ensure a clear opening of 2.25 inch x 1 inch for an area to be counted as rentable.