Professional management and screening will have the largest impact on how your investment performs month to month from a cash flow perspective. 

Without knowing more details about the specifics of the project being proposed as it relates to your property, it's hard to say if there are any obvious big red flags that could negatively impact your property's future value.That being said, I would try to find out as much information as possible about the new apartment building's design and layout - the two big things I would try to ascertain would be the location of the garage entrances/exits, as well as the location of any outdoor amenity spaces (pools, terraces, dog runs, etc).  

The most impactful way is financing.  

I hear risk mitigation and taxes often....from what I understand (but could be wrong) pass through entities like LLCs don't impact taxes all that much and a good insurance policy is much better on the risk management front than an LLC that may or may not be ran properly.

The gradual recovery of international travel and tourism could provide additional upside for the market, particularly for upper-tier properties.However, potential headwinds include:"- Flat population growth, which may limit organic demand increases- Economic uncertainties that could impact both business and leisure travelOverall, the Los Angeles hospitality market appears well-positioned for sustained performance improvement over the next several years, with upper-tier properties likely to see the strongest gains in ADR and RevPAR.Full Market Report: https://d2saw6je89goi1.cloudfront.net/uploads/digital_asset/...Contact me for a complimentary market valuation analysis report for your hospitality property today.

In San Francisco county for example population decreased 7.4% and house prices decreased 6% so a decline in population should impact house prices?!

I was simply using a metaphor to help explain tax's impact on commerce, that's it. 

Usually people with 700+ credit score are serious about their finances and don't want anything to negatively impact them (late or no payments)

I am not sure how the owner occupancy requirement of the JADU impacts value, but is will impact value as there are many RE investors who do not want to owner occupy.You should be able to determine the value by calculating NOI and knowing the market cap rate.  

What programs or masterminds have you found to have the biggest impact on your real estate career?