The house is 2,300 sq ft and we know the non-bedroom sections take up 1,000 sq ft, so that leaves 2300-1000 = <<2300-1000=1300>>1,300 sq ft for the bedrooms/bathrooms
Let x be the size of the master bedroom suite.
Then the guest bedroom is 0.25x.
So together the bedrooms are x + 0.25x = 1.25x in size.
This means 1.25x = 1300
So x = 1300 / 1.25 = <<1300/1.25=1040>>1040 sq ft
#### 1040