Then, down the road you can transfer the property into an LLC or land trust.Also, FHA is up to 1-4 unit dwellings, with maximum loan amounts depending on # of units.

RESIDENCY REQUIREMENT13 A person may not offer all or part of a dwelling unit as a short-term rental14 unless the person has occupied the dwelling unit as his or her primary15 residence for:16 (1) 270 days of the preceding year; or17 (2) if the person has owned or leased the dwelling unit for less than a18 year, more than 70 percent of the days that the person has owned or leased the19 dwelling unit.20 Sec. 3.

Dwell Finance is a division of B2R. 7.5% interest + points.

Building a greater amount of square footage on a lot all at once will likely lower the avg cost/sq ft for your project, but since you would be building multiple dwelling units (each with their own kitchen, bathrooms, utilities, etc.), the cost/sq ft is definitely going to be higher than if you just built a massive SFR on the lot. 

Technically, with the R1 zoning you can have 1 ADU and 1 JADU (if the property is owner occupied), but you may be able to use SB9 (Senate Bill 9) to have 2 units on an SFR zoned lot and, depending on if LA allows it, an ADU for 1 or both dwellings.

When you say "DADU", we're talking about a dethatched accessory dwelling on the same lot as an existing single family home.

So why dwell on it?

One of the good things about Tacoma is that it allows non-owner occupied Accessory Dwell Unit (ADU). 

FWIW if I was to dwell on the past I'd probably never get out of bed lol.

This is especially important if your dwellings are in more wind prone areas.