Interim occupancy and closing can technically happen at the same time, although there is usually a few weeks or months between the two dates. I would be surprised if it takes very long in this case. I expect closing will be shortly after interim occupancy. Our interim occupancy is end of April. It looks like the townhomes/mid-rise are all getting done around the same time. All that would be left is the landscaping. Their incentive is to close as quickly as possible, and I am planning for closing to happen shortly after interim occupancy.
I actually planned for the opposite -- a longer interim occupancy.
Imo, the shorter the interim occupancy, the better it is for us. Because the rent payment to builder will likely have the current mortgage rates built in, so I doubt it will be any less monthly payment compared to after we close. Whereas after we close, at least we will get to pay down part of our principal (however little lol).
I did an 18-month lock on a 3-year fixed rate in case interim occupancy is longer than expected, so I don't risk scrambling for a new (and potentially higher) rate lock.
Happy to hear your thoughts.