Commercial lease - being sued for old rent
I will try to keep this very short. My wife's Michigan business recently closed and moved out of the facility - with proper notice to LL. She was off-lease - it had expired months before so it was a month-to-month arrangement. BTW, the business is incorporated.
Several months after closing we got a letter from LL's lawyer demanding almost $20,000 in unpaid rent.
I questioned my wife and she admitted she hadn't been keeping up with the rent. I looked at the accounting software and found that in fact she had been behind in rent for 16 months, rarely paying the full amount and one month not paying at all, most months paying a significantly reduced amount.
Did LL register a complaint via writing or through legal counsel during the period in question? No. Did he lockout the site until the rent was brought up to date? No. Did he initiate eviction? No. Did he make any attempt to repossess? No. Did he advertise the site to find a new tenant? No. Did he put a For Lease sign in the window? No. When the lease expired did he demand to be brought current before going month-to-month? No.
On the contrary, did he continue to perform as landlord throughout the 16 month period of consistently late, insufficient and even occasional missing payments? Yes.
This seemed crazy to me that this letter was the first official notice of any problem. We offered to settle for just the security deposit he still held. He refused and has now sued us.
Is it legitimate for LL to fail to mitigate for 16 months and then expect the entire difference? Doesn't he have any obligation to act to limit his own damages? If he continued to perform without action over a period of 16 months - doesn't that imply acceptance of the payments as they were?
Are either the "failure to mitigate" or "waiver by acquiesence" defenses valid?