Fairly well read and open to partnerships/syndications/apartments.

If you have to ask question #2, you are in over your head in getting into a syndication. 

After 45 + years investing in, purchasing and selling notes and real property; structuring “deals”, running investment funds and syndications, I have observed that many (most) investors both hesitate too long gathering too much information before making an offer AND do not do enough investigation, analysis and due diligence before they finalize a purchase.Seems like opposites, right?  

If not, can you take advantage of a syndication that plans to purchase a property by the end of the year and do a cost segregation? 

Please provide useful advice on locating, assessing, and negotiating private money lending deals, especially from seasoned professionals.

Hey Jake,You'll definitely have some options with DSCR lenders, but you'll need to be really sure that the lender you use is okay with underwriting STR income as well as with the ADU as a mid-term as they are kind of tricky.With DSCR loans, your credit score is going to be a big determinate to where you will lend.

Not sure if it would make sense for you specifically, would need to know a bit more about your situation and everything, some people we help that are looking to consolidate debt consider refinancing to lump all their payments together since a primary residence lending option has lower rates than some of the alternatives. 

If you have a history of having rented the property by the room, a lender will very well look at the rent you have gotten and lend based on that (or at least the DSCR won't reduce below whatever LTV is offered on the appraisal).

My apartment listings are done electronically on Buildium and syndicated to zillow trulia, hotpads, etc. 

Single family or 100+ unit apartments with professional management, Triple net leases, syndications.