And yes, back about 30 years ago, here in LI New York, people are concerned with minorities moving into the neighborhood, and telling me be careful who you sell to, not criminals, is somewhat of a code word.Finally OP was asking about problems with assigning contracts in general, and my point was the assignor has no control over the property any more, and the property can be sold to criminals, or undesirables, or minorities.

The property is extremely mismanaged and the tenants are quite undesirable. 12 of the units are affordable housing tenants and 5 of them are on a master lease with this company who lets the homeless community use the units.

The constant drumbeat against landlords in CA has made it a really undesirable place to own over the long term (which is why I stopped buying rentals here a few years ago and have been a net seller). 

If you try to rent at this current time you may get a more undesirable tenant.

Take an RE course so you feel like your doing something for yourself to make you happy and gradually move away from the undesired job. 

Properties of this nature easily become defacto transient hotels if located in undesirable areas. 

When it comes to hard money for seasoned investors, it's the points that really makes those loans undesirable/unprofitable.

Used improperly, the "rule" could encourage investors to buy properties that are very undesirable and difficult to make profitable even though the "numbers" say otherwise.

Also it may have other undesirable things like rates, drugs/crime.

Not to mention every deal I do I make 30% more with the exchange rate, 1 CAD = 1.30-1.35 USD, which is very attractive.Thinking in terms of cash on cash roi, the high prices in the Vancouver and Toronto renders these big cities undesirable.