My dad used to manage other people's properties but eventually quit because the money wasn't worth it and he always ended up prioritizing their properties so as not to get any hassle from them.Another way to approach this might be to go all in on one project yourself and see how far that money gets you. 

They are usually funded by very wealthy people or a group of investors pooling money together.

It's people like you who cause folks who would actually benefit from an ESA to be painted with the same broad scammer brush. 

First, Are you licensed and insured to manage other people's properties?

You would be amazed at what people will steal.

Otherwise perhaps your winter people will pay $500 extra if your cap is $500 and that is not what your competitors will be doing. 

Most lay people have zero idea how to get through a transaction.

Talk to the local CUs and get to know the commercial lending people.

The people you are going to for capital have it for a reason....

Find the people who turn dirt into pads, pads into foundations, foundations into hosueses and houses into communities.