How properties are evaluated for investment or selling

I am wondering what is the best route to take for the 1000 sq yard single story property siting in the prime location of block h, n.Nazimabad street#1 hydari market.

1) evaluate and sell it?
2) divide it into 2 x 500 sq yard plots to sell as a plot?
3) divide it into 2 x 500 sq yard plots built new 2 stories house and than sell it?
4) sell 4 units separately as a portion?

The house is old build 1976 maintained ok.