They seem to be trying to use a PMC model designed for Class A properties/tenants for Class B, C and sometimes D.Can't use the same business model for all classes of properties/tenants. 

@Kris Lou Many factors go into PMC pricing:1) Locality (city/state)2) Neighborhood & Property Class (time to manage Class A < Class B < Class C < Class D)3) Property condition (slumlord properties hard to manage)4) Number of units (some economies of scale, but not as much as owners think)5) Owner expectations (some owners really want a personal assistant!)

@Allan C. 

The real estate investing industry uses "Classes" to rank property performance risk, but there's NO agreed upon industry model:(Here's what we use for our Metro Detroit market:Recommend you first figure out the property Class you want to invest in, THEN figure out the corresponding location to invest in.Property Class will typically dictate the Class of tenant you get, which greatly IMPACTS rental income stability and property maintenance/damage by tenants.If you apply Class A assumptions to a Class B or C purchase, your expectations won’t be met and it may be a financial disaster.If you buy/renovate a property in Class D area to Class A standards, what quality of tenant will you get?

On paper, my C rentals have amazing cash flow.

@David Spurlock from approximately 2012 to 2016, you could buy a depressed valued Class A rental and rent it for immediate cashflow in many parts of the country.After Class A property values recovered, investors moved to buying Class B rentals - but used the same assumptions they used for Class A rentals.After Class B property values recovered, investors moved to buying Class C rentals - but used the same assumptions they used for Class A rentals.

This is the simplest method, but it also means your tenants are more likely to abuse the utilities by leaving windows open with the heat or A/C running, leaving lights on, ignoring the toilet that constantly flushes on its own, etc.3.

Please stop asking us for "the best" zip codes to invest in.Detroit has around 183 Residential Neighborhoods - wouldn't it be nice if "some proprety mangagement company" Classified them all as A, B, C, or D on an interactive map that real estate investors could use to make better decisions?

My buy box is C+/B- 2000 sq ft or better, no HOA, no Pool, 2.5 bathrooms or better and plenty of parking. 

I have two options 6.625% 30 year or 6.15% 15 yearI want to invest aggressively in the near future on more propertiesThe loan is only $110k and the monthly payment for 15 year is $563 and $750I will earn 2-3k a month in gross rental revenueThe property is in a declining population areaRecently rennovated, and all major things were relatively recently improved such as plumbing, the roof, a/c, electric, etc.Will require a lot of management as it is rent by the room so I may switch to a normal rental after 10 yearsI'm trying to find what will mathematically net me the most money in the long run.