Final answer:
The unspent hotel occupancy tax collected, amounting to $350,000, should be classified as a) 'Restricted fund balance' since the funds are legally constrained to be used only for downtown beautification purposes.
Step-by-step explanation:
In the scenario outlined, the remaining $350,000 of net assets should be classified in the Special Revenue Fund's balance sheet as a. As Restricted fund balance. This is because the collected hotel occupancy tax is imposed by law for the specific purpose of beautifying the downtown area, which places legal constraints on how these funds can be used. Thus, until such time as the funds are spent for their designated purpose, they remain restricted. Other classifications like unassigned, assigned, or reserved do not apply in this case due to the existence of restrictions mandated by law. It's important to properly categorize these funds to ensure transparency and compliance with legal requirements.