Another bonus: most new construction builders are offering generous incentives to buy down the rate and increase cash flow. 

Bonus if you’ve done this in the Sacramento region and/or have contacts for companies and individuals who can help me achieve this.

City of SD has actually gone well above State ADU guidance...any existing '2-unit' zoned property can get up to 7 total units....2 units per your zone allowance1 attached ADU 2 detached ADUs1 'bonus' ADU with the inclusion of 1 'affordable' ADUThe City code also clarifies that you do not have to build your remaining density before constructing the ADUs...and if your are in a Transit Priority area you can propose as many bonus/affordable ADUs pairs as you want.

The tax benefits  of bonus depreciation in syndications are also amazing. 

Hey Orlando,The bonus content is only available with purchase through biggerpockets.com/store.

The site is in transit priority area so technically I can utilize the ADU bonus density to build unlimited number of ADU.

You also have bonus depreciation, 179 expensing, and this exception as well:Small taxpayer exception for eligible building propertyQualifying small taxpayers can elect to deduct the cost of improvements made to eligible building property (Regs.

I would totally rent the property and STR/MTR the bonus suite.

i would say the most cost effective unit would be a garage with a bonus room, typically you can get half of the picth as footage in the truss so if you have a 40x60 garage you can get livable space above if (built in the truss) of 20x30=600 sq ft.the only down fall we have seen is stairs but most people dont mind if as long as your location, fit and finish are good

DepreciationThis is probably the best part, tax wise of owning a short-term rental property; How you write off business expenses for example consumable supplies for your rental business vs assets such as large machinery/cars/etc.Qualified Business Income(Purchase Price - Land Value) ➗ 27.5 years = Depreciation Tax Deduction(39 years for commercial properties)Bonus Depreciation: Since 2018, short-term rental owners have been allowed to deduct the full cost of property such as appliances and furniture all in one year using 100% bonus depreciation.