I purchased all at $300 each and am thinking of placing cashflowing assets on them instead of reselling them, since resell value is around $1200-$3000 each. 

Quote from @William Dorrough: I currently either purchase and value add large scale multifamily properties or develop, and build ground up my issue with scaling is we have done this without brining in investors i have a great deal flow with a good track record im really looking to do more i have the capacity but have the need for more capital in one way or another  Scaling without investors can be tough, especially in multifamily.

As a percentage closing cost as percentage goes down as value increases but we will 15X to account for closing costsNo cash flow per OP.2% market appreciation equated to 30% + 15% = 45% 3% market appreciation equates to 45% + 15% = 60%4% market appreciation equates to 60% + 15% = 75%Recognize in virtually all markets the cash flow increases with hold length especially if a fixed rate loan. 

Do this quickly because some counties have a time limit on when you can appeal.I recommend you research the market for:- Comparable Property Sales- Condition of your property, including anything that may affect your property's value- If you are really serious, an expert appraisal may be worth the effort.

In general, government will set the assessed value lower than market value at reassessment in order to neutralize appeals.

Ideally, I’d like to become so much of value that I’d be paid for my help/ services.

How did you add value to the deal?

@Paul Whitney Detroit property values increased over 20% in 2024:https://detroitmi.gov/news/detroit-home-values-increased-ave...https://www.cbsnews.com/detroit/news/detroit-home-prices-amo...https://www.detroitnews.com/story/news/local/detroit-city/20...DM us if you'd like more info...

To make the strategy successful, you need to find a property that can be acquired below market value.

However, it's important to know your value!