Lexington is known as a desirable neighborhood west of Boston with a good school district, making it a popular area for Korean families looking for homes. Due to the school district premium, home prices are generally high, and when combined with mortgage rates, the monthly payment burden can vary significantly for each person. Therefore, most people who come for consultations ask first how current rates are determined.

Mortgage rates are not arbitrary numbers set by banks. The most direct benchmark is the yield on 10-year U.S. Treasury bonds. Most 30-year fixed mortgage products are priced with a certain spread added to this Treasury yield, so when the Treasury yield fluctuates, mortgage rates also move with a lag. Additionally, the Federal Reserve's (Fed) decisions on interest rates also have an impact. While the Fed directly sets short-term money market rates, market expectations about future rate directions are reflected in long-term rates like mortgage rates.

Inflation indicators are also crucial. If the inflation rate comes in higher than expected, bond investors will demand higher yields, which leads to upward pressure on mortgage rates. Furthermore, mortgage loans are often bundled into MBS (mortgage-backed securities) rather than held by banks, and the supply and demand dynamics in the MBS market also directly affect rates.

As of 2026, the average rate for a 30-year fixed mortgage is reported to be in the mid to high 6% range according to Freddie Mac PMMS. The 15-year fixed rate tends to move between the high 5% and low 6% range. The shorter the repayment period, the lower the risk for the lender, which results in relatively lower rates.

ARM, or adjustable-rate mortgage products, often start with lower rates than fixed-rate products for the initial few years. They adjust based on market rates after a fixed period of 5 or 7 years, making them worth considering for those planning to sell after a short stay or expecting future rate declines. However, there is also the risk that rates may rise after the adjustment period.

• 10-year Treasury yield and Fed interest rate direction
• Inflation indicators and MBS market supply and demand
• Personal credit score, DTI, down payment ratio

Even within Lexington, the actual rates received can vary significantly based on the applicant's credit score. Generally, the most favorable rates are available for those with credit scores above 760, while those in the 620 range may see differences of around 1 percentage point. The down payment ratio and DTI (debt-to-income ratio) are also factors considered during the assessment process.

In areas like Lexington, where school district premiums are evident, the inventory is limited, leading to consistent demand. As a result, some buyers rush to purchase even during periods of relatively high rates, making it important to carefully compare the conditions offered by different lenders. Even at the same time, the offering rates and closing cost structures can vary by lender.

Korean families should prepare income documentation in advance, as this can affect the speed of the assessment and the rate offers. Especially for self-employed individuals or those with mixed income from Korea, the document preparation period may take longer, so it is advisable to consult with lenders well in advance. While there are forecasts that future rates may gradually decrease depending on the Fed's policy stance, it is important to keep in mind that this direction is not guaranteed.