@Jason Seay, if they're married the deposit is a marital asset. 

And the split is whatever you decide on. 50/50 is what a lot of people usually do.

Streamlined Lot Splits -The bill also allows property owners to split a single-family lot into two separate parcels.

I am thinking to remove package unit and instead of that put split unit.

You can - 1) establish a trust for asset protection, 2) utilize the Homestead Exemption for property protection, 3) consider tenancy by the entirety for marital property (this might just be applicable to California, my home state)4) make sure you have adequate liability insurance for additional protection, 5) think about forming a business entity to shield assets, 6) and have proper estate planning for asset distribution.Seek tax and legal advice from experts in your state.

When we split up the actual assets were mine.

Right now between my house and ADU, we split the water based on the square footage. 

Your broker may feel entitled to an additional split based on past dealings or conversations with this client.

Find out what they offer as far as education and support, what their fees/splits are and what their expectations might be.Remember, you will need a certain amount of continuing education hours, and you will want a Brokerage that has the support you need to help you through your contracts and answer questions.

Would I pay for all the remodel expenses and then 50/50 split of profits or does contractor pay remodel cost?