Bringing in a partner, second mortgages, line of credit are sources of additional funding to close. 

In addition, we have a big umbrella policy.So, as I was getting an insurance quote for this 11th property, we were told, our personal umbrella policy will only cover up to 10 properties, and anything beyond that we will need to get a commercial umbrella policy.

Additionally, it's easy for a house on one lease to get absolutely trashed by the renter.

Here is a list of why adding a single ADU in single family zoned areas in my CA market is typically a poor RE investment:1) The value added by the ADU addition is often significantly less than the cost of adding the ADU.

I would like to get some additional ideals on how to possibly go about this though.  

and do you have to put additional money into the project? 

And if you join Lowe's Pros, you'll get an additional discount (it's free to join).

There are also additional costs of operating and maintaining an LLC, like separate bank accounts, annual report filings, tax filings, etc.2.

I know this is a very old thread but if anyone comes across it I wanted to add some additional thoughts that might be helpful.

Additionally, trying to spot paint even a white wall with white paint doesn't work, let alone other colors.