Real estate (buildings, facilities, land) in Ukraine remains one of the most popular assets for investment. There are several reasons for this: volatility of the hryvnia, low confidence in banks and pension programs, underdeveloped stock market, etc.
If you intend to rent an office as an individual, you’re going to need legal grounds for staying in Ukraine - temporary or permanent residence permit; alternatively you can act as a business entity by registering a company in Ukraine (e.g. LLC) or become an entrepreneur.