Per cost data, above grade GLA is $131 per sq ft, below grade GLA is $56 per sq ft.  $56/$131=0.43%.  Example: if the markets reaction to above grade GLA is determined to be $50 per sq ft.  $50 x 0.43=$21.50 per sq ft for basement GLA.

Date of Appraisal: 20170316

Adjustment Amount: $0.43%

All sales are final unless the data provider made significant errors or omissions that would impact the credibility of the analysis.