So, is it a good idea to start with creating a LLC and website to develop a business platform? 

Most solar engineering software accounts for average weather conditions for your zip when sizing the required system to offset your electric consumption.

They are tearing down properties in my area, and putting up new ones, and I'm able to search the public records and find out how much the developers paid for the property.

It could be a decent size project for a fence that will most likely be torn down once the split off lots starts being developed.

I am looking for any advice on job cost accounting software.

The wealthy developers I know will often ask for owner financing just because it's easier than tying up more cash.Cash is king and just because you have it doesn't mean you want to have it tied up.

My management software buildium lets them pay online. 

This is derived from a model developed by the credit industry and would include homeowners who are just over-stretched with high mortgage and not enough income.

Then develope an exit plan to limit your loss.

Hypothetically, as a builder / developer, would you pay a slight premium for property that has the federal historic tax credit of 20%, a state historic tax credit of 25% and a city empty building tax credit of 25% - capped at $500,000, as well as a dense mixed use approved PUD, and a tentative $5 mil TIF district for the site?