The scenario described in the question presents several indicators of potential money laundering through real estate, which the broker should be aware of and report accordingly. The most relevant red flags are:
Value: The student wants to buy a home that is overvalued, meaning that the asking price is higher than the market value or the appraisal value of the property. This could indicate that the student is trying to launder a large amount of illicit funds in one transaction, or that the seller is colluding with the student to inflate the price and receive a kickback. Overvaluing or undervaluing properties is a common technique used by money launderers to manipulate the price of real estate and conceal the source or destination of their funds12.
Inconsistency: The student's behavior and profile are inconsistent with the typical characteristics of a legitimate home buyer. The student cancels the viewing of the home at the last minute due to illness, which could suggest a lack of interest or a pretext to avoid scrutiny. The student also wants to buy an expensive home despite being a student, which could indicate a discrepancy between the student's income and the source of funds. Moreover, the student disregards the broker's objections to the asking price, which could imply that the student is not concerned about the value or quality of the property, but rather the amount of money that can be laundered through it34.
Transaction speed: The student wants to quickly buy the home, which could indicate a sense of urgency or pressure to move the illicit funds before they are detected or seized by the authorities. Money launderers often use fast transactions to avoid raising suspicion or leaving a paper trail. Transaction speed is especially relevant when combined with other red flags, such as cash payments, anonymous buyers, or overvalued properties5 .
References:
Understanding Money Laundering in Real Estate
RED FLAG INDICATORS FOR REAL ESTATE SECTOR
Investigating Money Laundering through Real Estate
AML Red Flags Associated with Real Estate Sector Businesses
FinCEN Proposes Rule to Combat Money Laundering and Promote Transparency in Residential Real Estate
[ACAMS Study Guide, 6th Edition, Chapter 7, pp. 200-201]

FSRBs are regional bodies that work with FATF to promote the implementation of AML and CFT standards.
FSRBs are made up of member countries that have agreed to work together to combat money laundering and the financing of terrorism [1]. The tools used by FSRBs to promote the implementation of AML and CFT standards include training measures, mutual evaluations of its members, technical assistance, and the sharing of information. FSRBs may also adopt recommendations and best practices based on the FATF's 40 Recommendations.

The Office of Foreign Assets Control (OFAC) is a US agency that administers and enforces economic and trade sanctions based on US foreign policy and national security goals1. OFAC has a list of sanctions programs and country information for various regions and topics, such as Russia, Iran, North Korea, Cuba, and more2. If a charity is headquartered in a country on the OFAC list, it means that the US government has imposed restrictions or prohibitions on transactions or dealings with that country, its government, entities, or individuals. This poses a high risk of violating the sanctions regulations and exposing the bank to legal, regulatory, or reputational consequences. Therefore, the bank may decide to terminate the banking relationship with the charity to avoid such risks.
The other options are not sufficient reasons to terminate the banking relationship, as they may not indicate illegal or suspicious activities by the charity. A high turnover rate of official positions may be due to various factors, such as organizational changes, staff turnover, or personal reasons. It does not necessarily imply that the charity is involved in money laundering or terrorist financing. However, the bank should verify the identity and authority of the new officials and update the customer due diligence information accordingly. The charity may have several incoming international funds transfers because it receives donations or grants from different sources or countries. This is not unusual for an international charity, as long as the funds are consistent with its stated purpose and activities. The bank should monitor the transactions and report any anomalies or red flags to the relevant authorities. The flow of funds both in and out may be complex and hard to trace because the charity operates in multiple jurisdictions or sectors, or has a decentralized or layered structure. This may increase the risk of money laundering or terrorist financing, but it does not necessarily mean that the charity is engaged in such activities. The bank should conduct enhanced due diligence and ongoing monitoring of the charity's transactions and beneficiaries, and apply a risk-based approach to mitigate the potential risks.
1: Sanctions List Search Tool | Office of Foreign Assets Control 2: Sanctions Programs and Country Information | U.S. Department of the Treasury

A compliance officer should consider the following three factors as part of the approach to implement an enterprise-wide anti-money laundering program for a bank that operates in multiple countries:
The types of customers serviced by the bank: Different types of customers may pose different levels of money laundering risk, depending on their nature, source of funds, geographic location, transaction patterns, and other factors. A compliance officer should identify and assess the money laundering risk associated with each customer type and segment, and apply appropriate due diligence measures, monitoring systems, and risk mitigation strategies accordingly12.
The extent of anti-money laundering regulations in the various countries: A compliance officer should be aware of the legal and regulatory requirements and expectations for anti-money laundering compliance in each country where the bank operates, and ensure that the bank's policies and procedures are consistent with them. A compliance officer should also monitor any changes or updates in the anti-money laundering laws and regulations in the various countries, and adjust the bank's program accordingly34.
The anti-money laundering risk posed by the products and services offered by the bank: Different products and services may have different features and functionalities that could be exploited by money launderers, such as anonymity, cross-border transfers, cash transactions,complex structures, or new technologies. A compliance officer should evaluate the money laundering risk associated with each product and service offered by the bank, and implement appropriate controls, safeguards, and oversight mechanisms to prevent and detect money laundering activities5 .
1: ACAMS, CAMS Study Guide, 6th Edition, Chapter 2: Risk Assessments
2: FATF, Guidance for a Risk-Based Approach: The Banking Sector
3: ACAMS, CAMS Study Guide, 6th Edition, Chapter 3: Compliance Standards for Anti-Money Laundering (AML) and Combating the Financing of Terrorism (CFT)
4: Deloitte, AML Program Effectiveness Reform
5: ACAMS, CAMS Study Guide, 6th Edition, Chapter 4: AML Program Design
[6]: OCC, Money Laundering: A Banker's Guide to Avoiding Problems