[tshaddox]

My point was that you could try to think of your storage unit as if the size and monthly cost of your home was more flexible, i.e. you can just pay 2% per month for 2% more space.

When you chose your house there were presumably several options with different amounts of storage space at different price points. You could just treat the addition of a storage unit as increased granularity between those housing options.

[qwertycrackers]

Storage space is really just tacked proportional to bedrooms, for the most part. My house has what feels like a bunch of extra space because I wanted enough bedrooms for my family. They didn't need to come with so much extra, that's just how they build homes with more than a few bedrooms now.