Who is Man City most expensive?

Could you clarify who or what you mean by "Man City" in this context? Assuming you're referring to Manchester City Football Club, the question "Who is Man City's most expensive?" could be interpreted in a few ways. If you're asking about the most expensive player on the team, that would likely be someone who has been transferred to the club for a high fee. Alternatively, if you're asking about the most expensive asset Manchester City owns, that would depend on their investment portfolio and could be a property, a stake in a company, or another type of asset. Can you please specify which aspect of "most expensive" you're interested in learning about?