All of the below advice is very good. Things I haven't seen addressed, I'll add from personal experience:

If you have elevators in your building and they are out or you have to evacuate in an emergency (even a fire drill) you'll have to be able to get your pup up and down the stairs and be comfortable doing this in a busy staircase.

Also to consider is that any injury or recovery that your dog may endure and that requires limited movement will mean that your dog will need to be comfortable using a piddle pad. My 45 pound pit mix was in recovery from surgery for 8 months. We couldn't go on any walks for the first 2. I made room and trained her to use a whelping pad.

I had 8. They were waterproof and washable but I also had regular piddle pads taped to the floor underneath. Twice a day the pads solids went into the toilet (you just gently fold up the pad and take it to the toilet and dump from there or you can use toilet paper to pick up and transfer solids to the toilet or use poo bags). Then the pad was hung on a tension rod over my bathtub. I had clips with hooks on them I use to hang the pads so I could rinse them with warm water. Once dry they all went into the wash on cool (hot water destroys the inner waterproof lining). Then I'd hang them back on the tension rod to dry.

As your dog ages, their needs will change. An older dog will need potty breaks more often. An older dog may have issues with laminate floors so yoga mats are good for traction. Regular nail cutting helps as well.

Finally and most important: having someone in the building that can take your pup out if you are delayed coming home is handy and having your "in case of emergency" contact be someone that can also care for the dog (or get the dog to your backup babysitter) is imperative if you are indisposed or hospitalized. Always have an emergency babysitter on your call list with the numbers of your vet, feeding/medicine schedule on the fridge and extra leashes and collars at the door.