What to Know Before Buying a BMR Home in South San Francisco

If you have been priced out of the South San Francisco market and assumed homeownership was years away, I want to introduce you to a program that changes that math entirely: Below Market Rate (BMR) housing.

I get asked about this constantly, especially when a new development comes online with a handful of BMR units attached. Right now, that is exactly what is happening at Sterling Place, the new construction condo community at 889 McLellan Drive, directly across from the South San Francisco BART station and steps from Trader Joe's. New BMR units surface periodically as developments like this one complete their inclusionary housing requirements. When they do, the opportunity can be significant for the right buyer.

But BMR homeownership is not like a typical purchase. It runs on city rules, income tiers, and lottery timelines that most buyers have never encountered before. Here are five things you need to understand before you jump in.

1. BMR Homes Are Priced to Income, Not to the Open Market

BMR units exist because cities like South San Francisco require new residential developments to set aside a percentage of units as permanently affordable housing. Instead of pricing based on comparable sales, these units are priced according to Area Median Income (AMI) tiers set by the city and county. That is why you will see multiple BMR units in the same building with very different price points. A unit reserved for a lower AMI tier will carry a dramatically lower price than a unit reserved for a higher tier, even if the two homes are identical in size and finishes. The City of South San Francisco's Housing Division sets these tiers and updates income limits annually.

2. It Is a Lottery, Not First-Come, First-Served

This is the detail that trips people up most. You do not simply submit an offer and negotiate. Eligible buyers submit a pre-qualification application, and the city selects among qualified applicants through a lottery process. Being fast does not help you here. Being prepared does. According to South San Francisco's BMR Procedures and Guidelines, applicants who are not purchase-ready, meaning they lack financing pre-approval, sufficient down payment funds, or a completed homebuyer education certificate, are not considered eligible, regardless of lottery placement.

3. First-Time Homebuyer Status Is Required, With Specific Rules

You and every adult in your household generally cannot have held an ownership interest in a residential property within the past three years to qualify. The city's guidelines get specific here. Ownership of a manufactured home not permanently affixed to a foundation, for instance, does not disqualify you. If your household situation is anything other than straightforward, this is worth reviewing carefully before you apply rather than finding out after.

4. Household Size and Occupancy Requirements Matter as Much as Income

BMR programs are not just checking whether you qualify financially. Many listings have minimum occupancy requirements tied to unit size, and your household size directly affects which AMI tier and specific unit you are eligible for. A two-person household and a four-person household earning the same income may qualify for entirely different units in the same building. This is why a quick conversation about your exact household composition matters before you decide which listing to pursue.

5. Financing Has Its Own Rules Too

Not every loan product works for a BMR purchase. Conventional and many first-time buyer loan programs are compatible. Still, stated-income loans, adjustable-rate mortgages, interest-only loans, and balloon-payment structures are typically prohibited under BMR program rules. You will also need a lender pre-approval letter as part of your application package, and it must be obtained before the city's deadline, not after. Lining up a BMR-experienced lender early is one of the simplest ways to avoid losing your spot in the process over a paperwork issue.

The Bottom Line

BMR homeownership can be one of the most powerful paths into the South San Francisco market, especially for first-time buyers who assumed they had been priced out entirely. But the process rewards preparation, not speed, and each development's timeline and income tiers differ.

Buying a BMR home in South San Francisco does not have to feel confusing or out of reach. It just takes the right guidance on income tiers, timing, and financing to put your household in the strongest possible position.

👉 Curious what income tier your household would fall into, or want to get ahead of the next BMR opportunity? Let's build your strategy together.