For example, if the proposed project estimation total is 90K, can a group of investors invest 30K each, each gaining their fixed interest on it based on their contribution?

While I agree its not as lucrative as something like implementing a BRRRR strategy for example, isnt investing 100k in a place that will bring you about 800 of a 1200 income a month worth the investment price?

For the sake of simplicity, I will use Class 1 as an example here. 

For example, crowdfunding, note investing, syndications to name a few.

For example, I am from Cleveland, but after my time in China is done, I plan to relocate to Tampa, FL area.

As an example, will it need siding in 5-7 years, this could be a $20k project.

In your simplified example, the deferred gain should be $140k

There is some repair costs needed to touch up the place like carpet and fresh paints, will this be something that we will need to do prior to having the tenant/buyer accepting into the property?

I'm absolutely fresh at this game.

At lease renewal we will do a 12-month renewal.This is just one example of many of the value-added services a (good) property manager can provide.