Safety - Learn about Crime Prevention Through Environmental Design (CPTED) and employ the concepts at your property.

In CA where there are more homeless than any other state in the country, I can tell you that the reason for the lack of housing is due to the high cost of permitting, length of time to get through the process in many areas, not enough land zoned for higher density, the strict environmental laws that have all but outlawed new septic systems in outlying areas, a water penalty, required sprinklers in houses, and now coming up in 2020, solar on new homes!

My PM tells me we may need to dig a few feet down to try and repair the leak after the next rain and we've been able to positively ID the general leak location.My question is, other than interviewing folks during DD, what is the best way to determine issues that are only present during certain environmental conditions (i.e. high winds or strong rain)?

Financing can be "easier" since lenders will take into account the existing rents but do make sure to research thoroughly and have experienced mortgage / real estate / legal people on board since the commercial realm, even at an entry level, is a whole different level of complexity and risk (zoning / permits / environmental / leases). 

I currently work in the environmental due diligence field and want to begin working towards developing a passive income through real estate investing.

We hired an "environmental hygenist" to test the mold and air to determine what the mold was and how significant. 

I am looking at a property that will require some environmental clean up before a bank would fund construction costs. 

And you'll also need to get with your local municipality for zoning issues, as well as look at the environmental impact, geo-tech surveys, etc. 

There are also people without jobs for one reason or another (most cannot keep a regular job due to various issues and it is not primarily they are lazy - various reasons from addiction to psychological issues, etc.).The environmental climate of Southern Ca is attractive for the homeless. 

And the reasons for this discount are:- the property is being sold "as-is"- that the MH's are very old and in bad shape, - it's been very hard to find an insurance company that wants to take the job,- the same happens with the financing, not a lot of institutions will lend leaving the property mainly on the hands of developers,- but the property has already failed at least a couple of feasibility studies,    - It's been on the market for over a year,- In a couple of months the county will start a tax sale,- The maintenance needed is mainly demolishing 4 standing structures, clearing all the junk in the property plus landscaping (this is what I am considering in my repair costs as for now),- There are no records of maintenance jobs done on any of the units, owner will not provide any information about the property neither will do any diligence to provide such, no environmental studies (although the county said that is potential home of an endangered species), - the only fact provided is that it is zoned R-4,- although the property has a wet land area, and 1/3rd of it is forestry