Point is, we don't see a higher turnover based on size of unit. 

My system is "short cyclng" due to it being over-sized.  

Different sizes of apartment buildings have varying typical operating costs.So you have size of the building 10,20,100,300 units etc.Location of the building A,B,C,D,FAge of the building A,B,C,DQuality of the tenant baseand on and on.Are you trying to syndicate as a sponsor or buy yourself? 

A final thought is,  a coin operated machine would encourage her to be conscience with the size of the load.  

@James Wise offered a good perspective as someone who manages a considerable size portfolio.

Anyone have experience with approximate ball park of what it would cost to bump it out to a size that meets egress?

Financing depends on deal size.

There are three other factor, both very controllable, that also slow or eliminate depreciation:The quality and/or size of the home in the first place;High quality homes use better materials which last longer and look better longer thus increasing the probability the home will hold value.Homes smaller than 16'x80' normally depreciate faster than larger homes because small homes are truly out of fashion (forgive me tiny home advocates) and because smaller manufactured homes look more like "trailers" than a home.The way the land lease community is operated.Well run communities looking to protect the long-term investment of the community over short-term gains almost always stem or slow home depreciation. 

In full disclosure, I never have done a loan this size personally only has dealt with banks for clients and know many friends who own very large portfolio who deal with banks on a regular basis. 

I am wanting this discussion to be more about the extent of rehab rather than the size of the project, if that makes sense.