Cost PSF of Mid-Rise Construction?

[Andrew Taylor]

What is the ballpark cost to build a multistorey building (say 3-5 floors) vs. a single story building? Been considering building a group of 4bed/4bath detached units for student housing, but I'm wondering about the feasibility of building larger units instead. Obviously there's less slab and roof, but I'm unfamiliar with this type of construction and unsure of costs beyond that. Just looking for a general idea so I'll know whether the option is worth considering.