When you increase the rent on multi-unit properties the value of the property increase 10 to 18 times the rent increase due to the Gross Multiplier.If you have a 100 unit building with a GRM of 13 (very average) and you increase all the rents by $100 you just made a profit of 100 units x $100 per month x 12 months  X GRM 13 = $$1,560,000 INSTANT increase in property value.First year profit = $1,560,000 + $300 / month cash flow x 100 units x 12 months = $360,000 = $1,920,000.If you increase the rents a tiny $50 every year your profit for the one building is $40,320,000You cannot even do that with SFR's because they don't increase in value when the rent is increased.profit just by + you earn an extra cash flow every year = $120,000.

He does all the legal filings for the LLC coordinates the tax return and K1s for the LLC, pays all the tiny amount of bills for the LLC and acts as the broker as well.

To answer your question specifically, look for loose or curling shingles, discoloration, particles stripping from the shingles and falling in the gutters (they look like tiny pebbles), streaking, or roof leaks inside (a very late sign). 

Years ago when I was a teen I was working for a surveyor.

Ohio properties cash flow a tiny bit more for me.This is my personal experience with 6 properties, purely anecdotal

They take some technique or strategy that’s only workable or beneficial in a very tiny percentage of situations and generalize it as a major breakthrough.  

(Tiny old postage stamp lots)in parts of the bay area its mandatory to change the drain line when houses are sold if they are a certain age and still clay pipe.. my brother in law does a ton of them.. realtors are his source.. many times they just pipe burst.. and are done in a few hours for 6 to 8k. when I was doing my rental thing in the deep south we could get a new PVC from house to street 50 ft or so for 1500 or so.. if we did it during rehab and not under stress.. 

Increase portfolio by 100 units (a combination of a tiny home community in Florence, Arizona, a condo development in San Tan Valley, Arizona, a few multi-family properties and or mobile home parks, and 20-40 single family residences in Arizona and the triad area of North Carolina - mostly Greensboro and Winston-Salem).2.

The reasons for investing are much more than just cashflow, that is 1 tiny tiny part. 1.

@Cassidy BurnsMy wife and I will be looking to buy a home with a few acres at the end of year, and put a couple tiny house Airbnb’s on the land.