Ask HN: Other cofounders want to split an office?

I have an alternative plan. Get a hotel room. You can book it by the day, it is cleaned every day, and most hotels are now offering day-time only packages that people use as offices. As a plus you earn points and you can pick a new location anytime you want. The front desk may also be willing to store flip charts, markers, etc.

You may have to think a bit outside the box to make this cheaper and easier. I have seen it done by just asking people with offices near the two of you to let you rent office space from their offices. Many places may have surplus space. Not sure of your exact location since you did not mention it but even a super small studio apartment or backhouse on a month to month basis would end up cheaper in most places.

Just want to say: this post is a great way to do user research

Have you considered the possibility of finding a larger company or startup in the area with extra space, and then renting out space from them for the 1-2 days per week? It might be easier than finding someone else to split an office space with.