As I was planning the small renovation that would see the end of the boarding house, I realised the house was serving a clientele not being reached by our other student apartments.We decided to leave it for a year to measure the behaviour / performance and found that it had low vacancy, no defaulted payments, no damage, and the tenants almost always brought us new tenants before they would leave.Just over 2-years in, we are still happy with the house ... it is more work, but it is also more return.

Hey @Ariel Vincent The majority of properties are booked at listing price, for those anomalies which are not, we would consider this unusual behaviour and would not pick this price change up.

For many the fear of dealing with tenants never goes away and as such they will put up with bad tenant behaviour, rents below market and numerous other issues simply so they do not have to actually manage the business. 

Tenants damaging properties out of revenge is not typical behaviour for the vast majority of people in the world.I would give notice that they will be required to sign a M2M and it will include a $100/month rent increase.

I think most people in business want to be liked, in fact, sales success has always been linked to strong interpersonal skills.

Report her unprofessional behaviour to the real estate board.

Why would you take a loss because of their poor behaviour.

We are being watched and our behaviours & how we treat our tenants helps to develop your reputation. 

I then ask that they cease communications with us.If the behaviour continues, I will speak with the tenant about their parent's conduct, explain the legal/contractural situation and advise that they speak with their parent.It's not just with landlords, my wife use to teach at a local university and helicopter parents were routinely contacting her about their child's assignments and in-clase performance.  

Great interpersonal communication skills are a necessity for success in almost any industry, but especially in the people-to-people world of real estate.