Mortgage--A finance instrument to obtain money using with a fixed asset or collection of assets used as collateral.
Capitalization--the act of writing assets that are expected to have lives longer than a year onto the books at purchase or build price with the idea that they will be depreciated over the life of assets, usually with a residual or scrap value calculated into the depreciation schedule.
Leasehold improvement--The addition of money/assets to a leased property that have a useful life over one year and need the expense to be depreciated over the useful life.
For clarification purposes, most capital assets are mortgaged or financed in some way.
Like-kind transactions are neither rare nor hard to handle. For a CPA, doing one is just another Tuesday task.
How ever dealing with clients that think they know accounting is the biggest pain to any CPA.