@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.

I can absolutely assist…I am a Full Time Realtor and RE Investor here in Ventura County.I help the full range of clients buyer, seller, renters, investors etc. 

We have a wide range of investors and RE professionals join us.

With DSCR, credit and down payment are the major factors (plus the property itself of course) so it is very possible since a lot of the properties in the area cashflow pretty well. 

Depending how much of the neighborhood is a hot zone for renting rather buying, and which Property type is performing better than the other (meaning 1bd 1ba 2 floor renting out faster and much more consistently than a 2bd 1ba 1 floor), you can make your choice of those factors as well as other ones that impact your decision for what you wanna do with your investment.

You can still find single-family homes in the $80k–$100k range and duplexes in the $130k–$150k range, even in C and C+ neighborhoods that are seeing steady improvements.

I'd use an approved underlayment.Pro Tip: If it's cheap, it's not good.....at least spend in the moderate range.

Several key factors contribute to Buffalo’s sustained real estate prominence:1.

DOM can be minimized by a number of different factors including the quality of marketing, rent price, availability to show. 

It's not easy in DFW right now due to the price runups over the past few years and now slowdown in the market.What price range do you want to be in?