My coach suggested (and I implemented) a "must do tracker"....it's a color coded spreadsheet (I like to print multiple copies and keep them on a clipboard to stay in my sight/top of mind). 

While permits for ULS may take up to 1.5 years, MDUD projects can proceed faster, provided all requirements are met.Let’s break down the numbers for San Ysidro, a promising area for development.

Do they provide exclusive leads, or are they shared among multiple investors?

I think it is really up to what you can provide to the investor.

A good ballpark is $1,000–$2,500 per unit, but this depends heavily on how extensive the turnover is and whether you’re self-managing or hiring contractors.If you’re looking for more precision, connecting with local property managers or contractors can provide insight into typical costs for properties like yours in the area.

The duplex provides a separate living space while receiving income.

Quote from @Lorraine Hadden: As we close out 2024 and look forward to 2025, NAR released its 2025 list of top performers in 10 metro markets.

Without knowing stuff like this, all the answers provided are meaningless. 

An additional benefit of a detailed engineering-based Cost Segregation Study is that it can increase potential insurance premium savings as well as provide support for the property tax appeals process.

The Ohio market is one of the top markets to invest in from a distance.