I'm looking to split/build 15 hours of ME with someone in the Arizona area.

There is a Seneca available for $225 an hour at Angel Aviation at GEU.
You will have to get checked out in the plane in order to be safety pilot and vice versa.

I am also open to other options if anyone has any for Multi.

I would be interested. I am in need of 17 multi hours. I sent the school you referenced below an email asking if they have a minimum hour requirement to rent their Seneca; let's see if I hear back.. I would be traveling from MN. When are you able to do so? Are you local to AZ?

Yes, I am local to AZ. It appears that they have raised their prices. I just checked and it shows the rent price at block rate is 275 an hour. I also know of another place in HLN Montana that rents an Apache for 225 an hour. Vetter Aviation. If this is more convenient for you then we can meet there since its cheaper. I got my multi at Vetters and I highly recommend them.

My availability is 2 weeks on, 1 week off. So every 3rd week I am available to do this. Ideally, I am looking to fly the 15-17 hours in 2-3 days.

PM me and we can talk more!

I would be interested for time building single engine if that is something you are interested in. I live near SDL.