How finished attic sqft are priced?

[Alex Kuntsevych]

Hi BP,

i'm running comps for property and it has 1600 sqft. it has 2 dormers and it's possible to finish attic space.

Attic will add about 300sqft

comparable homes sold for 135$/SQFT and they are in  range of 1400 sqft.

Does the attic space price same as main living space?

should i calculate ARV like this - (1600+300)*135

or like this - 1600*135 + 300*x