Looking at the stl, I can see a few issues that might cause problems printing it in one piece....
1) The door handles are too small for successful printing with a 0.4 nozzle
2) The doors also have very thin sections around the outside of each of the panels
3) The stair spindles also look as if they will not print easily with a large nozzle
It may be the combination of these three issues that is giving the blobbing and missing bits.....
I would suggest yo re-engineer the part so that the doors are separate...make them wider and put slots in the walls for the doors to slide up into. I would also separate the staircase newels, spindles and handrails from the staircase and print as a separate part. You can then print the doors and stair handrail, etc using a 0.2 nozzle. I think the window will be okay, but will need carefully placed supports.
I'm a master of having to 3D print a kit of parts...in the case of this not-so-small structure, 663 individual parts.