I would recommend a combination of a house-hack and an investment property depending on your current cash position, short-term and long-term goals. 

When an entity is structured correctly you’ll be able to qualify for deep tax deductions against your w2 income through the business combination structure ( A structure that qualifies an individual for deep tax deductions) 

Partner Driven financed this deal using a combination of private capital and partner contributions.

Partner Driven financed this deal using a combination of private capital and partner contributions.

Or a combination of both. 4 months on the market and lowering it to $1700 tells me that you might have a dump AND/OR your comps are WAY off.

Be sure to clarify the lender's stance on total CLTV (Combined Loan to Value) at 100%, as not all will accept this structure.

So if at death it is worth $5m, and of that $5m based on the waterfall agreement you and your sister would get a combined $800k - that $800k does not get stepped up, just the $4.2m that belongs to your father does.If your father is subject to estate taxes, and there are substantial discounts taken on the valuation of partnership interests in his estate - that cuts back on the step up, but it saves steeper estate tax, so it is a worthy trade most of the time.

. - Wife and I never made over $150k combined- Buy and hold is the primary strategy- House hacked twice- Took some major hits along the way.

Combine this with poor ADU valuations (especially in single family zoned areas) result in hands off ADU additions costing significantly more than the value they add.  

Net net, I think it offers a product that is 80% as good as the best accounting software and 80% as good as the best property management software, but all combined into one.