I want to thank you on front BP community .I'm trying to purchase a mixed-use property using a FHA loan these are the details on the property the property has three Apartments and one commercial space which I believe is less than 49% of the residential part of the property.I was  Told by one lender that yes I can buy this property because is less then 5 unit.

@Christopher Bennage sound like most of the front end items have been taking care of but I would still check with the city and the engineer who drew up the plans.

It's kind of like going to the superstore and the cashier forgets to ring out your big screen TV with all of your other items.

I plan to present detailed math with AVR, pictures, timeframe and exit strategy.

BDS has a good Change of Use or Occupancy flyer - https://www.portlandoregon.gov/bds/article/125287 - that lists the exact situation I'm curious about: "changing a house or duplex in a non-residential zone to a short-term vacation rental," but I can't find more detail about it anywhere else.The City has no shortage of info about accessory short-term rentals that Airbnb will partner with Portland to enforce permits for next year, but I'm interested in requirements for non-accessory short-term vacation rentals (as articulated in that link) located in non-residential zones.

Another key item is default. 

@Robbie Reutzel, would you mind explaining the 45-50% rule in just a little more detail please?

But make sure you are also setting some money aside for the future big items like roof, HVAC, water heater, siding, plumbing, etc...

I don't have all of the details, but I worry that the management company could be taking advantage of them.I do not have the capacity to get involved and am not educated in this area, but was wondering if anyone has general advice on how she and the other condo owners could best seek to protect themselves and resolve their dispute with the management company?

There are a lot of details missing here.