This is same question why in US we have culture of tipping when other country do not , also why in Us there are just so many added layer fee for attorney , legal and sort of.To be quick , higher commission in US happened because American way of doing business is not efficient, there are layers for law, legal and attorney fee.

He layer said the windows were all put in incorrectly and needed to be redone because letting in air.

Since your passive income currently covers your living expenses, there are a few extra layers you want to be sure you have someone with the analytical experience to guide you to the proper approach.

The investors for conventional loans (Fannie & Freddie) layer on to the pricing (i.e., rate and points options) for condos.

I love section 8 because it guarantees a certain % of rent, the tenants really value that housing voucher and won't do things to risk losing it, and section 8 has strict criteria for condition of the unit which adds a layer of accountability on my property manager. 

That's typically the first layer of protection before you'd be required to make a claim on your policy.

There are multiple layers to REI.

There is much to learn in all the layers. 

Certainly layers to your scenario but there may not be a solution based on what you have stated.  

It's not recommended that you exceed 2 layers.