Why Rising Apartment Competition Is Driving Rent Decline Across Major Markets
- Apartment vacancy rates in San Diego County have reached their highest level of the 21st century, according to data from CoStar.
- The increase in available units has shifted leverage toward renters, leading to a decline in asking prices across various segments of the multi-family housing market.
- The surge in vacancies is largely attributed to a wave of new apartment completions that have outpaced immediate demand.
Apartment vacancy rates in San Diego County have reached their highest level of the 21st century, according to data from CoStar. The spike follows a period of aggressive new construction, which has forced landlords to lower rents and offer incentives to attract tenants in an increasingly competitive market.
The increase in available units has shifted leverage toward renters, leading to a decline in asking prices across various segments of the multi-family housing market. CoStar reports that competition among apartment complexes is the primary driver behind these falling rents.
Why are apartment vacancies increasing in San Diego County?
The surge in vacancies is largely attributed to a wave of new apartment completions that have outpaced immediate demand. As new complexes enter the market, they increase the total inventory of available units, pushing the overall vacancy rate to historic highs for the current century.

This trend is common in markets where a high volume of multi-family permits were approved and built out simultaneously. The resulting supply glut means more units are sitting empty at any given time, which CoStar identifies as the catalyst for pricing adjustments.
How are landlords reacting to the vacancy spike?
Landlords are utilizing promotional deals and rental concessions to fill empty units. These incentives often include several months of free rent or reduced security deposits to entice prospective tenants to sign leases.
CoStar notes that these deals are not limited to older properties. New luxury developments, such as those managed by AMLI, have launched similar incentives to maintain occupancy levels as they open their doors to the public.
The use of concessions allows complexes to keep their “headline” or listed rent prices stable while effectively lowering the net cost for the tenant. This strategy helps property managers avoid a permanent drop in the perceived value of the asset while still competing for residents.
What is the effect on rental prices?
The increase in competition has led to a general downward trend in rental costs. When multiple complexes in the same neighborhood compete for the same pool of renters, landlords are forced to lower prices to prevent their units from remaining vacant.
This pricing pressure is most evident in the luxury tier of the market. Because many of the new units hitting the San Diego market are high-end apartments, the competition is most intense among properties offering similar premium amenities.
While the overall vacancy rate is at a century-high, the impact varies by specific sub-market. Areas with the highest concentration of new construction are seeing the most significant rent drops and the most aggressive leasing deals.
How does this compare to previous market cycles?
The current vacancy levels represent a significant departure from the tight rental markets seen in the previous decade. For much of the early 2000s, San Diego’s rental market was characterized by low inventory and steadily rising costs.
The current shift indicates a correction period. The influx of supply is providing a relief valve for a market that had previously struggled with a severe shortage of housing units relative to the population growth in San Diego County.
According to the CoStar findings, the current environment is one of the most favorable for renters in recent history, provided they are looking in sectors where the new supply is most concentrated.
