If you are building to sell and your profit margins are higher for the larger units, that may be a good argument for building bigger.My rentals are in central and east Phoenix, so we have a lot of young professionals and small families we rent to. 

For me, I wanted to portray my real estate investments as more professional and that was the main reason I switched to using landlord software for rent collections. 

They are very professional, reliable and informative.

@Philip Jones we've helped our clients do over a hundred.As some of the lenders posting have pointed out, the challenges are:1) Property value and corresponding loan size2) Appraisals have much better comparables than 5 years ago, but may still be an issue.3) Property condition can be an issue via the appraisal4) Ownership seasoning - most lenders looking for 6+ months or incredible documentation for cost of improvements made.5) Most DSR lenders require professional property management.Always try a small local bank or credit union, but most will expect you to transfer your business bank accounts over to them. 

Readers should seek professional advice.

Off-market deals are the best way to secure a low purchase price, however, finding off-market deals can take some persistence (and luck) Did you work with any real estate professionals (agents, lenders, etc.) that you'd recommend to others?

Of course, have a professional inspection done that enters each unit and do a sewerscope.

One was a medical professional couple working at Beebe, the other a family relocating and needing a place to stay while their house was built in Lewes. 

If your adjusted gross income (AGI) exceeds $150K and you are not classified as a real estate professional, passive losses from rental properties cannot be used to offset your earned income.

A good vendor will often provide insights and a documented professional opinion, which can serve as third-party confirmation.