So, I don't even know what to google at this point. I've looked at all sorts of written notices to vacate but none of them seem quite appropriate in my situation. My boyfriend and I are currently sharing the rent of an apartment with our roommate, Brad. Brad is the only one on the actual lease of the apartment and we are subleased under him. On our lease with him, it says that we need to give him a written notice, which I totally understand. See, the tricky thing is that we're moving to the apartment right next door so I'm having trouble figuring out what I really need to put in the written notice. Everything I've seen has the forwarding address, mentioning that you want the security deposit back, and that they may contact you. 1) The forwarding address is practically the same address 2) our main landlord is transferring our portion of the security deposit over 3) if he needs to contact us we live in the same house currently. So when you eliminate all those components you just basically get the statement of "we're vacating this apartment on such-and-such date" and that seems rather pointless I guess.
PING ME
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Just be as open and honest about the situation as you can. I'd tread very carefully since the old roommate will be in the same building and you'll be staying on as tenants of the old landlord as well. Can you call a meeting of all 4 of you together at a coffee shop or invite the landlord over for tea and to oversee the signing of the formal notice?

The main landlord has already been notified, but since we are not leased under her she really plays no role in our intent to vacate. My main question is how do I write/deliver the intent to vacate to our roommate/master tenant? Like, it just seems weird to write a letter saying that we're moving in next door when we could easily just talk to him. Just seems like too formal, ya know?
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I'd sit down for a nice meal out (or in if you like to play hostess) without the landlord then and give him the paperwork after dessert and say, "Here's everything that we discussed over dinner in writing for you for formality's sake, good luck." Or something else along those lines.

"Like, it just seems weird to write a letter saying that we're moving in next door when we could easily just talk to him. Just seems like too formal, ya know? " I would say just that to him, assuming you're leaving on good terms, and then give him the paperwork. Even though it seems silly to be so formal and give him written notice, that's for legal purposes so if something does go bad you won't get in trouble for not letting him know formally that you were leaving. Just put all of the information needed, even if it seems silly or pointless, and make sure that he and maybe the other landlord has a copy