Honestly, I used the BP rent calculator, rules of thumb for variable expenses, and data from Rentometer.com, to get these numbers.

@Nikita Odnoralov Connect with a local investor/agent and get real time data form them onn similar units & always take airdna with a grain of salt.

I recently got a notice from the city about Critical test exam report on a 3 storey porch, does anyone know a good structural engineer that can do this and how much does it cost?

If you bring a camera you can save a ton of time by taking pictures of the documents and sorting through them later and inputting the data onto a spreadsheet. 

Currently managing a building in Ukrainian Village and need to have something called a critical test exam performed on a 3 story steel porch.

Take the course and then do the cram tests at the end and you will pass the state test with flying colors.  

Read a time tested classic real estate investment book, by an author like Bill Nickerson and Jimmy Napier5.

I always try to be on the side of the angels, but a deal that can pass the Doom-and-Gloom test is usually much more solid than one that depends on unicorns and candy sprinkles aligning with the planets. 

However, I see an uptick of numbers over past 2 years (assuming online census data is accurate).Is it a good idea to buy commercial space such as storage facility in Decatur?

It is very easy to use, pretty customizable and pulls data right in from the MLS which can be a time saver if you're dealing with an on market property.