Are they predicting these areas to continue trending upward or do you think the market will level out in the next year or two? 

@Allen B.since the reinvestment requirements to fully defer all tax and depreciation recapture are that you purchase at least as much as your net sale and use all of your cash proceeds that means that any amount you take in cash or any amount you purchase less than your net sale is going to be taxable until you've reached the full amount of your gain withdrawn as boot.So the amount that will be taxable is predictable. 

Im looking for information on how can I best predict the monthly rent for the section 8 units.

I think its hard to predict when I am hoping sooner then later.

If you can make it 5-10 years, you will be grateful for the risks you took.It is impossible to know if you would be better off putting it in an index fund as not one can predict the future.

Make sure you know every cost you can reasonably predict.

I would advise against investing in an area simply because an article is predicting future growth.

Example: we're living under a nation wide CDC eviction moratorium right now, which no investor would have predicted in the realm of possibility in Nov 2019. 

How do you revitalize or predict the revitalizaton of a neighborhood?

It is too difficult to predict or expect appreciation in the near term so I only concern myself with variables more in my control.I manage one condo rental but it is very low maintenance.