I know there are hundreds (thousands probably) of lenders out there that offer a DSCR product.

@Thomas Farrellmiscellaneous reactions-BRRRRs won't produce cash flow - they're an equity strategy, not a cash flow strategy-OOS BRRRR on your first deal will be incredibly difficult. 

This amounts to lost opportunity because if you had purchased RE, at the closing it can start producing return. 5) ADUs detract from the existing structure whether this is privacy, a garage, or just yard space. 6) this is related to number 1, but there are many more buyers looking to purchase homes for their family than there are RE investors looking to purchase small unit count properties.

We have a 30Y Fixed DSCR product that would likely fit your needs. 

Real estate is basically an income producing and or capital gain producing investment.  

For walls in common areas like halls and stairs, there are rigid products that can absorb some sound.

I wonder why they don't make roofline sprinklers or some other product like that. 

"Question: have you ever filled out a spreadsheet of cost and lifespan of each product of a property?

Small shop brokers that have access to multiple programs so that they aren't beholden to one or just a few loan programs will typically get the most competitive product for the borrower. 

Book recommendation #1: Hands Off Investor by @Brian Burke https://store.biggerpockets.com/products/the-hands-off-inves...Book recommendation #2: Lend to Live https://store.biggerpockets.com/products/lend-to-livePodcast Recommendation: PassivePockets podcast is focused on passive investing in syndications - https://passivepockets.com/podcast/Passive investing summit: PassivePockets Summit May 2-3rd in Columbus https://get.biggerpockets.com/passivepocketsevent/I make these recommendations specifically since you mentioned passive real estate investing, and syndications or hard money lending are really the two most passive ways to invest in real estate.