Pay attention to the duration.DM me if you want additional thoughts.Jeff

In most single family zoned areas adding a single ADU is not a value add meaning it will not add more value than the hands off cost of the addition.  

Given that you're not married, that adds some additional complexity.  

If you're in the LA area, it's definitely very common.

These are professionals with additional training and a stricter code of ethics.

The idea is to convert a multi-family building into condos; but not in the traditional sense where you separate pre-existing apartments into their own condos; but in a way where you combine the common areas of all of the apartments in that whole building, and turn the individual rooms within those apartments into condos themselves; thus transforming the hallways, kitchens, bathrooms, living rooms, dining rooms, porches, balconies into common areas of the condos. 

@Nate McCarthyProfit Splits and Contributions:Dividing profits proportionally to investment (2:1:1) is common, but you could also account for sweat equity if one party is doing more work.

Please DM me if you have any additional questions. 

These are professionals with additional training and a stricter code of ethics.

Additionally, listing brokers represent what seller's provide them.