I'm not sure if any local lenders will consider the property value once the ADU is complete when reviewing my loan application.

So MF unit over 15 years old is rent controlled (with a couple exceptions mostly for owner occupied 2 units) and MF unit that is under 15 years old is not rent controlled (again with some exceptions but they are unlikely to be applicable).  

For example, an RV Park that also had a restaurant on site and this qualified the applicant to go through SBA.  

The application is done in 10 minutes online, but I highly recommend establishing a good relationship with Amex before applying.

@Kristen DolotinaYES 100% a service like that existsSpeaking from experienceI had an out of state investor purchase a duplex in Texas & after closing the PM company handled the applications, screenings, placement of tenants for a 1 months rent fee.MY SUGGESTION:Google a local Real Estate Brokerage and call that number and just ask the person at the front desk (who answers the phone) who their recommendation is for a PM company and why.

It notifies the IRS of expected taxes on this income.Sending Forms 1099-INT as an Investor: Investors should send Form 1099-INT to private lenders if they meet two criteria:They operate as a “trade or business,” applicable to flippers and landlords.The annual interest paid on the private loan was $600 or more for the prior year.Private Lender Reporting: Private lenders must report the interest collected on private loans as taxable income, even without receiving a 1099-INT.

The application process was straightforward, but I had a question on the form and called the county. 

He has already submitted an application through Zillow, and we have the contact number of his current home manager.Please let me know if it's still a good idea to ask the potential tenant for a recommendation letter from their current landlord, or if calling the manager would suffice.By the way, what should we do if the tenant has simply provided a friend’s number, and the friend pretends to be the landlord or property manager, or if he just make fake letter?

As a house hacker, you can factor in the appreciation, amortization, cash flow (if possible), and your *cost of living savings if applicable. 

Is your DSCR ratio greater than 1-meaning are you cash flowing (according to the lender's criteria of mortgage, property taxes and insurance (and HOA) if applicable).