For the main house, I'd get a washer and drier. 

To me it kind of defeats the purpose of protecting personal assets and standing up the LLC.2. 

Incorporating a washer-dryer hookup in the main house could be advantageous.This addition not only increases the convenience for potential renters but also adds value to the property itself.

If the property is already built and in place with only one main for everything.

I wrote the above for informational purposes.

They'll want all the money spent on the main house, lenders kind of ignore ADUs it's weird. 

You can choose to report your income and expenses on Schedule C by electing to file as a Qualified Joint Venture instead of filing a partnership return.If you have created an LLC that is not in a community property state, and as husband-wife you are the only members, then you are a partnership and must file a partnership tax return unless you have elected to treat your LLC as a corporation for tax purposes.If you have created an LLC in a community property state, and husband-wife are the only members, then you are a partnership and must file a partnership tax return unless you have elected to treat your LLC as a disregarded entity or corporation for tax purposes.

Is your warehouse on a main road? 

I mainly am curious how people have raised capital for their first properties. 

I think the main thing I am learning here is to adjust the profit share between myself and my private money partners.