Final answer:
The additional funds for the increased costs of the high-rise tower project in NYC due to the design change to 90% concrete will likely come from contingency reserves or management reserves, which are set aside for unforeseen circumstances and unknown risks in the project budget.
Step-by-step explanation:
In the scenario where a high-rise tower construction in NYC is faced with a new tax imposition for glass exteriors and a tax reduction for concrete structures, switching to a 90% concrete exterior after a risk analysis involves identifying a source for the additional funds required due to increased costs. The appropriate source of funds in this situation would typically be the contingency reserves or the management reserves. Contingency reserves are budgeted for unforeseen work that is within the scope of the project, while management reserves are funds set aside for unknown risks that are not within the scope of the project and are used at the discretion of the project sponsor or management.
The risk budget is generally not a separate pool of funds but is instead a part of the overall project budget allotted to managing risks. Lastly, relying on the cash flow of the project when it is completed is not a feasible option for funding immediate construction costs, as this cash flow is speculative and occurs post-completion. Therefore, in this case, the project team would likely utilize the reserves allocated for such eventualities, which should have been a part of the initial financial planning of the project.