Commercial Building Cost Estimate?

[yogimagoo]

I've been looking to rent a yet to be built small commercial building (50sqm). Simple build double skin breeze block with single pitch roof. The building is simple internally - one toilet, one clinic room (with a basin), one studio room (empty room with wood floor) + small reception area. Anyway the developer is dragging their heals so I'm in the process of offering to buy the land and get it built myself. I've worked out value of the land but was wondering how much roughly would it cost to build this? And how much extra to add an extra floor to make it 100sqm?

[yogimagoo]

Thanks for that - roughly what I was thinking so hopefully a goer