5 residences Only

con - low amount of apartments to share costs and maintenance charges
Pro - less people to make decisions

Realize a building requires a certain amount of upkeep: roof, heating systems, electrical/elevator, the sidewalk infront of the building and any basement that extends under the sidewalk, public spaces. Those costs are pretty much the same in a building with 5, 10, or even 20+ apartments. In a case of just 5 units, that's not many people divey up the expenses. You could wind up with some eye-popping bills. If any problems involve hiring a lawyer, there are only 5 of you versus 100. Lawyers don't charge by the number of units--they charge by the hour. Same with accountants. If you are in a financial position to afford these potential expenses, then the privacy such a small building affords may be just the ticket. But "small" comes at a cost.

just hope the owners of the other 4 apartments are reasonable people.