Please help in analyzing a Quaruplex in Raleigh for STR and LTR

[Ramez Qubain]

Hi i need your help in analyzing this property. as you might know, Raleigh doesn't have many small multifamily homes due to zoning changes in the 80s and 90s. however i have come across this newly renovated Quad. please see this link and see attached the analysis. https://www.biggerpockets.com/...      https://www.zillow.com/homedet... 

my biggest concern, is the rental income. the advert says 1,500 per unit per month, however when i use the rental calculator in bigger pocket tools i get a much lower number. another concern is, there are no comps in the area to assess the value of the property since there are not too many multi family homes in the area. 

also how can i assess the income if i turn it into a short term rental?

once i fine tune the above numbers, i am then able to decide on how much the home is worth.