You'll generally find that your options are much more numerous and you have a great deal more flexibility with crowdfunding.

I need to create a detailed spreadsheet with the full amortization schedule that allows for quite a bit of flexibility - such as increasing the payments every 5 to 10 years, making extra lump sum payments at different times, etc.  

Sellers that currently have listings may likely be flexible with price.

Investors often need flexibility with assignment provisions, real commercial-style due diligence periods as opposed to the "inspection periods" we usually find in standard realtor's form contracts.

The first thing to consider is that the typical sales strategy with a new development is to sell the first set of units at lower prices to help build momentum and amend prices up as successful sales help build buyer-confidence.Depending upon market conditions, the total number of units in the development, and various other factors and variables, the difference between what the first round of buyers pay and the second round can be quite large.The first round of buyers are taking the most risk, and the builder is usually willing to deal a little to get the ball rolling, and so they're often more flexible and willing to negotiate. 

I got into this because my brother agreed that real estate would be more flexible to people had difficulty with "normal" working hours.That with being an active real estate broker in Texas for about 30 years but I never did that full time.  

I was considering managing it myself but I wanted to be flexible and wanted to have the ability to relocate for a couple of years.

Make sure that the coach is flexible and has time for you when you need to see him / talk to them.  

I can upcharge because I work with mostly younger people and they are ok with paying a premium for someone younger like them who spouts the ability to fix things in hours not days, who responds to questions in minutes, and can be flexible with things like payment type, etc. 

I tell students in my Airbnb class that they should consider renting to a traveling nurse or relocating professional for 3-6 months during the slow season, and that gives you the flexibility to open your place up to short-term rentals during the summer.