They are far more common now and harder to find models without but:1) these add cost to the purchase price2) they don't bring a lot of value3) they can leak or detach and damage the propertyI own around 50 doors and I cap off the line at the wall or in the basement with a valve and a cap so the potential for leaks is 0.00001% :-) 

I’m unsure what kind of notice I need to give them—does it work the same way as residential leases, requiring a 120-day notice?

Suman, like the all too common vast majority, is using incomplete math, and as is said "garbage in - garbage out". 

What kind of tenants do you have?

Buyers could look at a DSCR loan which does take into account the revenue from the rent but it doesn't count towards the value of the property.Now, buyers could look at a business loan of some kind but I am not sure they would qualify if it is only one property and even then, the value is mostly in the property and not the possible revenue. 

If you decide to take this kind of route, it's still very important to go in with a secure plan and also have at least 6 months of reserves. 

:D Thanks so much for the kind words.

It's going to vary depending on your own income outside of investments, your age, your ultimate goals, whether you want/need the income to live off of, and all kinds of other considerations.

What kind of partnerships are you looking for?

Your lender definitely should be able to count the 75%- I'm in Arlington and would be happy to connect you with my awesome lender who has been able to do all kinds of creative options to get to yes for me.