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I was fortunate and have a area in my laundry room that was designed for an upright deep freezer or an extra refrigerator. My safe fit the spot perfectly.

Maybe hire a structural engineer to check it for you. It may be fine in the right spot. Being in the HVAC business for 35 years I have done many new systems in this area and the building quality I have seen in most homes was less than impressive. It always seemed to me homes around here are built more for appearance on the surface than stability of framing. Just to clarify. I am not a structural engineer. It might be just fine. My worry of it had to do with my experience of seeing homes in our area in construction phases.

I bet you could get a structural engineer to check it for you for less than a couple hundred dollars.

It might be fine if placed where it is reinforced well. I went down stairs with mine due to my concern over this but my safe was around 1200 pounds and likely has another 400 pounds in it. Maybe check with the builder or have your blue prints looked at to be sure of the location.

That is a pretty heavy load considering the small foot print it is concentrated on. I would make sure of the construction of the building frame before doing it. I know there are stronger and weaker areas of the framing across the floor of a second story area. Maybe a corner along the wall would be areas most able to take the load?