2.5 kanal house in F-6/3 islamabad

A 2.5 kanal 4-bedroom house has been rented out to a foreign mission at a monthly rent of Rs.3 hundred thousand per month.

My 2 questions:

1) Is the rent O.K.? Or it should be more than 3ht?

2) What is the worth of this house in case the owners decide to sell it?