As a licensed contractor, I can provide insights to make sure you’re getting the best value and quality for your project.

@Polat CaglayanI've never seen a formula but here is a general rule of thumb for multifamily:The class of an apartment refers to the quality of the building, which can be determined by a number of factors, including age, location, and condition: Class A: These are the highest quality apartments, typically built within the last 15 years.

I will have a contractor do most of the work from now on Did you work with any real estate professionals (agents, lenders, etc.) that you'd recommend to others?

I'm currently adding all of my numbers for a 20-unit apartment building in for a test, and then I'll bring my other 90+ units.

If you want to build a large number of properties, get connected with local meetups. 

It also requires different reporting of that separate interest expense on the K-1 each year so the partners know they have the obligation of tracing that interest expense to however the partner used the distributed proceeds.I typed all this up and realized Mr Brooks has left the building and posted this 6 months ago, but hopefully someone else will find this useful!

While your condo snowball strategy builds equity, modest cash flow and HOA fees may limit returns.

He spent 20 years building it.

Build a strong team, prioritize cash flow, and take the time to understand the local market and regulations, especially for development projects.

Quote from @Theodore Sutton: Check out the site meetup.com and also the events page on BP for meetings up in your area to meet people like this and build relationships.