Understanding DAHLIA: San Francisco’s Affordable Housing Lottery System

DAHLIA is San Francisco’s go-to portal for finding and applying to affordable rental and homes for sale. Operated by the Mayor’s Office of Housing and Community Development (MOHCD), it was created to streamline a process that was previously fragmented across different property managers, paper applications, and inconsistent requirements. With DAHLIA, all city-regulated Below Market Rate (BMR) rentals, inclusionary units, and affordable ownership opportunities are listed in a single system with standardized application procedures.

What DAHLIA Does

Before DAHLIA, renters and buyers had to locate individual affordable housing opportunities on their own, often through separate property managers or physical postings. DAHLIA consolidates all listings into one searchable platform where applicants can:

• Browse active affordable housing listings

• Create a single profile used across all applications

• Submit applications online

• Monitor lottery results and follow-up steps

• Access clear eligibility requirements for each unit

How the Lottery Works

San Francisco uses a lottery-based selection system for most affordable housing opportunities listed on DAHLIA. The process is the same whether you are applying for a BMR rental or an affordable homeownership unit.

Step 1: Listings Go Live

Each affordable housing opportunity is posted with income limits, household size requirements, and a clear application deadline.

Step 2: Applicants Apply Before the Deadline

Applicants create a DAHLIA account, fill out a standardized application, and submit it before the listing closes.

Step 3: A Randomized Lottery Is Conducted

After the deadline, MOHCD runs a randomized, public lottery. Every application is assigned a random number, creating an initial unfiltered ranking.

Step 4: Preference Categories Are Applied

Preferences significantly affect final rankings. Some examples include:

• Certificate of Preference (COP) holders

• Displaced Tenant Housing Preference (DTHP) households

• Residents or workers within San Francisco, or in certain neighborhoods depending on the listing

After applying these categories, the system generates the final ranking list that leasing agents use to contact applicants.

Step 5: Income Verification and Screening

Being ranked highly in the lottery does not guarantee a unit. Selected applicants must still pass:

• Income verification

• Asset limits (if applicable)

• Background and credit checks (for rentals)

• Additional requirements for ownership units such as lender pre-approval or homebuyer education

If an applicant does not qualify, the property manager moves to the next ranked household, so make sure you qualify before applying to a unit/building you like!

Why Preferences Matter

Preferences are designed to address historic displacement and support existing San Francisco residents. In many cases, people with qualifying preferences are selected long before the general applicant pool is considered. Applicants who do not qualify for preferences can still succeed, but the odds vary widely depending on the popularity of the listing and the number of available units.

Common Challenges and Realities

The DAHLIA system is transparent, but the underlying housing market is competitive. Some realities include:

• Large numbers of applicants: It is common to see hundreds or thousands of applicants for a single listing.

• Strict income limits: Even minor income changes may affect eligibility.

• Long timelines: After winning a lottery, the verification and leasing process can still take weeks or months.

• Not all vacancies go through a new lottery: For re-rental units, especially as time passes after initial lease-up, some properties are allowed to fill vacant BMR units on a first-come, first-served basis if they meet specific MOHCD criteria.

Understanding these dynamics helps applicants set realistic expectations.

The Purpose Behind DAHLIA

Affordable housing in San Francisco exists within one of the most expensive rental markets in the country. DAHLIA’s role is not only administrative but structural: it attempts to provide fair access to limited affordable housing opportunities and ensure that selection occurs through a transparent, consistent process rather than through private waitlists or personal networks.

By combining a lottery system with documented preferences, the city aims to balance fairness, equity, and efficiency. DAHLIA does not solve the shortage of affordable housing, but it does make the system more accessible and organized.