I worked out some deed restrictions for the trees to provide a nice buffer between my lots and theirs but then they starting hammering we had to many lots ( even though we were within the code)  planning commission bowed to the public cut my lots by 20% my seller would not lower price and we walked  I LOST 80k on that one ( all the engineering i had to do up front)Seller was a well known doctor in town he was not happy what the neighbors did and since the property was in the county and this is Oregon..

Do you have equity in the properties to buffer against a turn in the market?

The number of rentals that make you financially independent with huge buffer is enough. 

They're a buffer because they're "available credit" on our credit report, and they've been there for a long time.

If you are careful, you try to over-budget with a buffer, and have a detailed scope going in, you have an opportunity to not only get the renovations done and create some equity but you eventually will be able to find opportunities to make the rehabs more efficient and create another source of leverage for yourself.

When we buy our units, we make sure that he have buffer in case the market were to drop.

I want an additional buffer of income by the time 2025 rolls around, or earlier, to secure this financial independence.  

Not having a job and supplemental income source or cash buffer torpedoes your pillar to negotiate.

I listed the property for rent and had a viewing and subsequent application to rent the next day at full asking price, providing a 30% buffer over PITI obligations to account for all expenses.

They can tell you about other issues and be a buffer.