10% down second home loans still exist.

You’re experienced so you should know that motivation exists on a spectrum.

It would be hard to raise the rent a ton on existing tenants especially if they are close to market rates. 

When we did it, new management had old manager transfer all funds held in relation to our account to the new management, including existing security deposits. 

You may have better luck with a cash out refinance, which would allow you to pull equity from the property by replacing the existing mortgage with a new one.

My thought was to build:1) detached ADU on the new lot with the existing home and 2) build a large SF and another detached ADU.Of note, in this county the ADUs can be up to 1500sf.

if something is just sitting on the MLS looking too good to be true... then it's too good to be true.these properties are going to have higher costs overall, be in more challenging neighborhoods, have very gnarly deferred maintenance and capex, potentially have liens, be high turnover, and require expert, highly knowledgeable, localized support to be successful. see for example this thread.https://www.biggerpockets.com/forums/48/topics/1137397-balti...and even at those price points, i think cash flow is fairly low to non-existent if rehabbed to a high grade, especially with DSCR debt. 

That didn't exist back then. 

Every marketing channel works (SEO targeting duplex sellers,  PPC,  cold call center, direct mail), and thats why they exist. 

Every 4-5 years they would use the equity in their existing home to get a HELOC/refinance mortgage to purchase another house.