If we also mean the commercial area, then the commercial area should be sold fully 1100 sq.m and the dwelling space 3320 sq.m, this gives us the sum of the money for finishing the house 1100 * $1309 (average) + 3320 * $500 = $3 100 000

Also should be considered that The project includes two identical blocs, to finish one of them we need to invest around 1.5 - 1.5 million US dollars, so to finish one of them we need to sell around 30-40 flats (in each)