You need a pitch to win in a personal letter.

Tenant also agrees to the following:-All drains, waste pipes, and plumbing are accepted as clear by Tenant at the time of occupancy, and any material blocking them after occupancy shall be repaired at Landlord’s cost, unless determined by repair person that such blockage occurred during the time Tenant controlled the Premises and due to some fault or negligence of Tenant, specifically excluding blockages caused by roots or backups from the street.

So, when you say they not do report on your personal credit report I guess you are talking about non-recourse loans? 

Ana,Based on experience and this market me personally I would avoid a HELOC for a few reasons.

Fingers crossed in 7 years I have not had to test my coverage, but in the area of my rentals a golf cart is expected with the rental.When they crash into someone else, did that person sign the waiver too ?

My PM used to have a person who did the payments and every year around Feb, she'd send out an annual statement for your taxes showing how much you got in rent, spent in repairs and management fees. 

Don't take it personally. 

Note ADU addition in a MF zoned area may be comped with a duplex but I personally think this is wrong as a SFH with ADU is not a duplex.- it is cheaper to buy a property with an existing ADU than adding one   In addition you would receive RE purchase financing.  

What happens if one of you decides to buy a personal home and need the credit to qualify for a new loan so needs to sell this one to make it happen, but the other partner not ready to sell yet, or doesn't want the capital gains. 

The total cost of project is more than we can qualify for based on personal income, although our W2 income and credit score all work in our favor.