Interest accrues if paid late6.

Hi friends,  purchased my first rental in may this year, got it rented in mid June, signed a 12 month contract with tenant, about a week ago tenant sent me an 'official' email that there is a mice/rat problem, although there were cheaper options I went with professionals who were charging me 7-8x only because this is a long term investment and I wanted to get it solved, the pest professionals sealed the attic and set traps, they followed by couple of times to remove traps and refill bait boxes, my tenant now sent me lease termination letter citing health concerns due to mice/rat problem, they paid for current sept month and said that I can keep half the deposit for Oct.What should I do here, they have three small kids so I understand the reason for concern but I am also doing my best to solve the issue, should I go ahead and accept their termination or should I fight it out, not sure if involving lawyer is good as I am trying to make some cash flow and not lose it.. please advice also I am from Texas and would love to hear about TX law on this.

New York CityCan a tenant living in an illegal basement sue the landlord for rent that was previously paid (in New York)?

Little bit of "social reverse engineering" got me to her bail bondsman, who wanted to get paid, and we got it done.  

Recently got NACA pre approved and started looking for multifamily properties preferably 4-plex within Triad area.

They don't get paid by you, the buyer. 

I understand such a transfer could trigger the due on sale clause requiring the note be paid in full when transferred from the owner's name to his/her LLC.

Any part of the sale price that exceeds the home's appraised worth must be paid upfront as a down payment at closing. 

I have a pre approval letter for a certain amount and I have enough cash for closing cost so all that it good.

He got the monthly cash flow, but when the homes were finally paid off, he lost the cash flow and had no equity.