My Landlord Signed Someone To My Lease Next Year And Is Convincing Me To Move

The situation TLDR:

• apartment
• Location: Berkeley, CA.
• I am renewing my lease but my building manager leased the apartment to another group and is desperately convincing me to move units, offering me rent discounts.
• Building manager also entered apartment without any notice.

Live in a 4b apartment in Berkeley, CA. We received a notice asking about renewing leases and my roommates all are not renewing, but I decide to renew with 1 friend. I have a lease signed.

The building manager starts texting asking if I would be willing to move to another unit. I try to ask him if anything is wrong with the unit because I don't want a shittier apartment than I already have. However when I ask him why, he ghosts me or tells me never mind. But he'll still text again in a week or 2 asking the same thing. He started offering $1000 in rent discount (one time, not per month), which I still declined (I really don't want to move). But today he told me he'd give me $2000 if I commit TONIGHT. I will be honest, $2000 split between me and my roommate is not an insignificant amount of money. So I am entertaining the idea, but I am still skeptical about why.

I tell him I am considering it, but I ask him for full transparency because I really want to know and discuss with me roommate. He texts that he toured my unit months ago to international students who were visiting (he didn't give us any notice btw). The international students are back home and have signed the lease for my unit (despite me and my friend also signing a lease). He said that apparently one of my roommates texted that we were not renewing which is why toured the unit (none of us texted).

On top of this I received a letter from the city that we are already overpaying the lawful rent ceiling but thats a whole other situation.

I am considering asking for larger discount but I want to know how much leverage I have in this situation. Is he able to pick the other lease over mine? Was he able to enter my apartment to tour? Can I take legal action and possibly get more money? Or is taking his current offer ok?

Other than the weird management, the apartment is really not bad. Thank you so much!

Edit: Clarified that the discount was a one-time thing not ever month