In preparing its consolidated financial statements at December $31,207,$ the following consolidation entries were included in the consolidation worksheet of Powder Corporation:

$\backslash$table$[[$Consolidation Worksheet Entries,Debit,Credit$],[$Buildings$,140,000,],[$Gain on Sale of Building,$28,000,],[$Accumulated Depreciation,,$168,000]]$

$\backslash$table$[[$Consolidation Worksheet Entries,Debit,Credit$],[$Accumulated Depreciation,$2,000,],[$Depreciation Expense,,$2,000]]$

Powder owns $60$ percent of Snow Corporation's voting common stock. On January $1,20$X$7,$ Snow sold Powder a building it had purchased for $$640,000$ on January $1,20$X$1,$ and depreciated on a $20-$year straight$-$line basis. Powder recorded depreciation for $207$ using straight$-$line depreciation and the same useful life and residual value as Snow.

Required:

a$.$ What amount did Powder pay Snow for the building?