Nashville Basement Finish Cost

[Tim George]

Purchased an older 50s cottage/bungalow home that has a decent sized basement. Basement is roughly 600 sqft with a very small one car garage opening and one window currently. I am considering finishing it out but am not familiar what to expect in the area for the costs of a project like this realistically or whether the investment would be worth it for the area. I had a realtor tell me that basement sqft has a formula of about 50% actual increase in sqftage but I am not sure if that was just relative to appraisal.  Does anyone have any first hand familiarity with this process and what to expect in terms of cost.