@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.

Be careful not to place your identity in your age/success in RE.

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First off congrats for looking into this realy estate stuff at such an early age! 

Your referencing effective age vs chronological age. 

Hey everyone, it’s Godsheritage here!

I’m thrilled to announce that I just closed on my first investment property within one week of joining the BP community! Even more exciting, I’m already getting my second prope...

I would like to know more about ways to use OPM  The only way to determine if the home is going to cost you a lot down the road is by determining the age of the mechanical systems & if the structure of the home is sound. 

For a rule of thumb, replacing a commercial boiler can range anywhere from $20k to $150k, depending on the size, age, and efficiency.

Quote from @Chaliyah Penick: I have a relative that is up in age and no longer able to afford the mortgage and are falling behind. 

My main goal is it be able to retire at age 40 from my main job and work entirely on my real estate portfolio.