That seems ridiculous and unnecessarily expensive (especially in Boston) to rent/purchase a secondary place and furnish it so both parties can comfortably work from home. They couldn’t get a two or three bedroom place to have separate home offices?
I understand that Nick comes from wealth and could probably afford this. But, nobody sane does the above lol
The most parsimonious explanation for the separate apartments is that they aren’t together anymore. Perhaps they amicably separated, but with Dan’s theatrically cryptic posts on instagram about being selective with people in his life, who knows.