No. The trust accounting for trust administration purposes differs from tax accounting. What goes to the income beneficiaries of the trust is in most states dependent on the rules of that state’s version of UPIA and what the governing trust instrument says. TrustUser will need to see a trust attorney or trust accountant to review the terms of the trust and apply the UPIA accounting rules to determine exactly what is to get distributed to the income beneficiaries. It's important for the trustee to get this right, and there is no simple answer to give on how that is computed, at least not without seeing the details of the trust involved.
Buildings do indeed depreciate in value over time and either need to be kept up or replaced. I can point you to any number of buildings right in my immediate area that are today not worth nearly what they were when they were new. Indeed, several have been torn down and replaced because they were not worth renovating or maintaining. Sure, the real estate value as a whole might be more because the land value increase offset the building value decrease, but the nevertheless, those buildings are not worth today nearly what they would if they were new.
Certainly it is possible to keep a building going for many years by spending money for the upkeep. You can do that with cars too. There are, after all, some old Model T's out there from a century ago still in fine condition. But that fact does not change that the general principle still applies: things like buildings, machinery, etc, do wear out and lose value unless they are maintained in like new condition, and that costs money to do. There is nothing special about a building as a opposed to machinery and equipment, a bridge, or whatever else we humans construct.