@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.

Investment Info:Small multi-family (2-4 units) buy & hold investment.

Investment Info:Townhouse fix & flip investment. 123 W 132nd St is a historic townhouse located in Harlem, New York.

Investment Info:Townhouse fix & flip investment. 159 W 129th St is a multi-family building located in the heart of Harlem, New York.

Issues 1) even garage conversion ADUs in single family zoned areas typically cost more to build than the value that they add.  

I’ve seen many buyers successfully execute this strategy over the years, turning such properties into valuable investments.

Hi Martti,I happen to be someone that lives, eats and breathes in this area of Real Estate investing every day in Detroit MI. 

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Been investing here for 9 years.

Hi,I am looking to invest first time with a turnkey developer,  who is buying the land and building a multi unit commercial retail center and some apartments.