Two months rent for placement would equal $2,500.  6% of $45,000 is $2,700.It doesn't sound like he grossly overcharged you based on what you were already expecting to pay. 

My first thought was that your PM is overcharging you for maintenance (which is where most PMCs make their real money, in my opinion).

So, there is no percentage of life left in it that you can charge the tenant for.I don't think you'd win in court over charging them for the A/C unit. 

And beware of letting them find their own maintenance and repair people they may overcharge you for. 

The tradespeople bill you directly and you can make your own decision whether or not you are overcharged. 

If you overcharge you are liable to attract very weak tenants who are willing to sign on for any price because they know they can't or won't pay anyway.

Originally posted by @Frank Chin:So no matter how strict laws in MA is, I don't think I would run afoul of it.There is a little more to Security Deposit management in MA than just not overcharging the tenant; you have to provide them with the account number and the address of the bank the deposit is kept at, you have to pay them interest at the actual rate paid by the bank or some minimum rate if the rate is not disclosed to them, as well as some other processes.  

This kind of behavior can happen when a tenant is trying to get out of a lease.If you have a property manager, is it possible they're over-charging you for maintenance issues, to collect more fees than necessary?

Ever accidentally overcharged a credit card, forgot to pay a bill, or misjudged an expense?

A more likely scenario is that your plumber over-charged you and did a bad job or that the deadbolt has always been problematic but your last tenant failed to report it.