At least take a whole hunch of shots starting at - 10ev and go up in steps of 2 EV till you are at like +6. At least you have room to play later, because if what s7habo said is true, you basically still overexposed all your shots.
It helps to have a laptop on shots like this so you can take a single shot to load directly into a program to show you raw histogram or flag raw over exposure. Go so low as you have to (always sticking to your base ISO) so you don’t clip your raw data.
Since most modern cameras can give you a clean picture if it’s underexposed by - 4ev, I imagine you don’t even need to merge shots to create the look you want. If you want to feel safe, go up by +2ev a couple of times to take extra shots for dark areas.
But it’s really hard to know when you are clipping your sensor, without looking at the data in he raw file. And you thought that what your camera would show as - 2ev would be safe. You were wrong, sorry :(.
You could keep the final result natural by using things like filmic, or go nuts with local contrast. Or mask the windows and use different exposure compensations (one for the whole image minus windows, then one for the windows). This gives you that real estate ‘out of the window look’. (lots of real estate shots just replace the windows or sky even, don’t forget!)