I live in a co-op building. They sent me a 1098 There's a note that says claim a certain amount for my maintenance as "capital contributions"what is that?How do I do it?

The building issued a 1098 separate from that of the bank that gave me my mortgage. It includes the amount I've paid towards the building's interest and taxes, and it also has a note to include a certain amount towards "capital contribution". (it's calculated based on my monthly maintenance fees). What is this? Where and how do I add it?