Also, I assume a 10% property management fee in my calculations and based on initial conversations.

If you use different sources it will be difficult to calibrate the different scores, but think of it as a percentage of the max available score.This particular score seems to be based on an applicant's credit history, including payment history, credit utilization, and credit availability. 

However it is largely based off of relationships and working history.

If one or more units are vacant, the remaining units often don’t provide enough cash flow to cover expenses, making it harder to meet operating costs.Maintenance costs: A fourplex comes with four times the appliances, plumbing, HVAC systems, and other components to maintain, leading to significantly higher repair and maintenance expenses than single-family homes.If you want to see the detailed calculation, read this BP blog - More Units Doesn’t Mean More Money—Why a Single-Family Home Can Beat a Fourplex.Resale value: Multi-family properties have a limited buyer pool—mainly investors—who base their offers on CAP rates.

Following - I'm based in California

@Dani Murai, while I can't give you a name of anyone in your area (I am not from there), when you are interviewing contractors, here are a couple things I have seen:I avoid any contractor that has a draw schedule based on percentages, i.e. 1/3 up front, 1/3 at halfway completed and 1/3 at completion.  

He's been out a long time and updates the information regularly based on the market and new applications & tools.

Then the tenant will rant a bunch of nonsense, have no evidence to back up his stories, and the judge will find in your favor based on the evidence provided by you.For future tenants, I highly recommend you read a book like mine or "Every Landlord's Legal Guide" by NOLO.

Computers can analyze property based on subjective data (square footage, # of beds/baths, etc.) but cannot calculate for objective data (quality of kitchen cabinets/counters, size of bedrooms and bathrooms, view out the living room window, etc.).You should study the market yourself.

@Fakaradin Floy as mentioned landlords in alexandria don’t need help renting units right now and will not risk arbitraging the unit that is solely based on your ability to rent the unit when you have no experience and will most likely take no responsibility for damage.Am