I may be misinterpreting here but I want to point out that it is totally irresponsible for you not to have insurance. Especially if you are in a high rise (this sounds more like a basement suite however)
If something happens in your suite (and you are somehow responsible) and causes damage, you may be found liable. Having insurance is having an advocate in your corner for these types of situations. It's not just about your possessions which replacing can be surprisingly expensive.
Here's what you do: get a written estimate for repairs from apple. Take a copy of that to your landlord and take pictures of the water damage on the ceiling, and anywhere in the suite. They will need these items for their insurance claim and subsequent repairs…..and your reimbursement.
If you only need a hard drive and memory you may be able to get these at NCIX on Broadway and even upgrade the harddrive to ssd for much less than apples suggestion. I would wait until the landlord tells you what he is doing before you do anything.
Next, get some insurance. It won't cost much and you should have it. Go for a replacement value policy.