Schedule C vs. Schedule E -- my wife received a 1099 from a subtenant for subleasing office space she doesn't own. Which schedule should I use, C or E, for this income?

One thread from several years ago said someone who used Schedule C had to amend a return and use Schedule E instead. Should I ask the payer to amend the 1099 to "other income" so I can use Schedule C? Or just put this income on Schedule E?