Generally, there are some programs for foreign nationals that are 25% for a single family rental and 30% for a 2-4 unit.  

He wanted it all sold as a single package with no owner financing.  

The property, though is not beach front, nor does it has ocean view, is just a short drive from some of the best beaches in the west, which are great for surfing, snorkeling, SCUBA diving.In the 1.21 acres there is a main single family home (4 br) which was divided in two sections one of which is being rented.

Quote from @Devin James: Gross Margin is an important calculation for developers/builders.Gross Margin = Gross Profit / RevenueWe shoot for a 20% gross margin on our New Construction HomesReal #’s:Home Sales Price: $374KClosing Cost: $18,700Cost of Construction: $258KLand Cost: $30KGross Profit = $67K$67K/$374K = 17.9% Gross MarginCame slightly short of our goal of 20%Homes Values and Build Costs are constantly fluctuatingI wish we had a crystal ball build larger homes. average new build in our market is 2200 square feet, 4 beds, 3 baths, 2 car garage and sells for 515k. construction costs lower if design is good and find the median or average home sale price and push that up. my guess is you built too small. 347k is cheap. we target 429-479k price range in columbus ohio for single family homes and also only purchase close to urban core where premiums are 20% higher and we build smaller like 1500 sq ft where price per square foot goes up. 

I am going to be lending to an investor on a single family home. 

The cost of a sewer line is the same whether it is on a triplex or a single family home, but with a MFU you can spread the risk.

Remember, not every single decision in your life has to make financial sense.

I'm the single breadwinner for my family (2 kids) so I don't know if I'd have the time and energy to both run this rental and manage my work so I can reach the income level to handle the bigger mortgage comfortably.I feel like this chance for us to have a rental property with positive cash flow won't come often so I really want to explore it.

It does not matter if you find the single best market in the US.

Just a simple 499 sq ft city approved plan, single story, 1 bed/1bath/full kitchen adu with living space.