Commercial Real Estate in San Marcos: Mixed-Use Zones, Industrial Districts and Specific Plans

By Matthew Martinez, Founder, CEO & Managing Broker, Diamond Real Estate Group. California DRE #01869679.

Commercial property in San Marcos sits in thoroughfare shopping districts, in the mixed-use zones along the city’s major corridors and near transit, in its light industrial and business park districts, and inside specific plan areas such as the University District and the San Marcos Creek district. Specific plans work like zoning wherever they apply, so first confirm whether the parcel is under the city’s Title 20 zones or a specific plan. This page covers the code as of October 2026.

Who controls the parcel

The City of San Marcos zones land under Title 20 of its municipal code, with zones shown on the official zoning map (SMC §§ 20.100.010, 20.200.020) (zoning overview). The city uses five specific plans: Heart of the City, San Elijo Hills, San Marcos Creek, Santa Fe Hills (Paloma) and University District. Each regulates character and development standards much like a zoning code, and Title 20 applies to anything a plan doesn’t address (City of San Marcos).

Verify the city boundary, since nearby unincorporated land follows County of San Diego rules. All industrial development, and many other projects, need Site Development Plan review under Chapter 20.515.

San Marcos zoning for commercial, industrial and mixed use

District	Intended uses	Notes
C Commercial	Retail, shopping centers, entertainment and restaurants along thoroughfares	60 ft / 5 stories; FAR 0.7; bars, drive-throughs and auto sales by CUP
NC Neighborhood Commercial	Everyday shops and services near homes	27 ft / 2 stories; FAR 0.3
OP Office Professional	Offices and personal services; buffer between commercial and housing	35 ft; FAR 1.25; hotels by CUP
MU-1 / MU-2	Walkable mixed use on corridors and near transit	20–30 and 30–45 du/acre; up to 48 ft / 60 ft
MU-3 (SP) / MU-4 (SP)	Job-based office/commercial; industry-centric mixed use	No residential; specific plan required
L-I Light Industrial	Light and medium industry, warehousing, R&D	60 ft; FAR 0.6
B-P Business Park	Campus R&D, offices, compatible light industry	35 ft, or 60 ft with added setback; FAR 1.2
I / I-2 Industrial	Full indoor industrial range; intensive industry with outdoor storage	45 ft; FAR 0.5

Sources: SMC Ch. 20.220, Ch. 20.225, Ch. 20.230.

The code uses three approval levels. Permitted uses (P) are allowed by right, Director’s Permit uses (DP) get staff review, and conditional uses (CUP) go to a hearing. In C, grocery stores, restaurants, hotels with 50 or more rooms and medical offices are permitted. Daycare, urgent care and indoor auto repair need a DP. Bars, nightclubs, drive-throughs, fueling stations and new or used auto sales need a CUP. In commercial zones, office and business-support uses can’t exceed 20% of a building’s floor area without Director approval (SMC § 20.220.040–.050).

Mixed-use corridors, the Creek District and the University District

MU-1 and MU-2. MU-1 is meant for major corridors and sites near transit, with storefronts and apartments above. It requires at least 2 stories and 25 ft, active ground-floor uses on 80% of the primary frontage, a 15 ft ground floor and 60% clear glass on main facades. MU-2 is denser, at 30–45 units per acre, 2.25 FAR and up to 60 ft (SMC Ch. 20.225). Both zones set minimum FAR and density, so a single-story pad building usually won’t qualify.

San Marcos Creek. The Creek Specific Plan covers about 214 acres along San Marcos Creek, bounded by San Marcos Boulevard, Discovery Street and Grand Avenue. It was adopted in 2007 and is being updated. The city released a draft update in August 2026 and a final draft for the Planning Commission on October 30, 2026 (City of San Marcos). Check which version applies to your deal.

University District. This roughly 205-acre plan near Twin Oaks Valley Road and North City Drive sits close to SR-78 and the SPRINTER rail line. A 2022 amendment allowed taller buildings, eased design standards, lowered overall density and moved the boundary with the Heart of the City plan (CEQAnet SCH 2008101083).

Industrial standards and operating rules

Use mix. L-I permits manufacturing, contractor offices, food processing, warehousing and R&D, while self-storage and urgent care need a CUP. In I and I-2, offices of 5,000 sq ft or more need a CUP. I-2 permits outdoor storage, equipment rental and building material yards as primary uses (SMC Ch. 20.230).
Next to housing. Industrial buildings set back 20 to 30 ft from residential property lines, and loading doors facing residential must be 60 ft back. Outdoor storage goes behind the building, screened by 6 to 10 ft walls.
Commercial next to housing. Step-down massing, screening walls and loading limits apply where commercial zones abut residential (SMC § 20.220.050(D)).
Overlays. The Ridgeline Protection Overlay and the Flood Damage Prevention Overlay can add permits and setbacks (zoning overview).
Transitional zones. Existing industrial uses can continue under an initial zone until the land is rezoned (Ch. 20.235).

Transfer tax, business tax and property tax

The San Diego County Recorder collects documentary transfer tax at $0.55 per $500 of value, net of liens assumed, for both the county and its cities (SDARCC). I did not find a separate San Marcos transfer tax. File a Preliminary Change of Ownership Report at recording. A sale reassesses the property under Proposition 13. Confirm San Marcos business license requirements with the city before you open or lease.

Due diligence that matters in San Marcos

Find out whether a specific plan (University District, Creek, Heart of the City, San Elijo Hills or Santa Fe Hills) or Title 20 governs the parcel.
For Creek District sites, confirm whether the 2007 plan or the 2026 update applies.
In MU zones, check the minimum FAR, height and active-frontage requirements against your program.
Check whether the use is P, DP or CUP. Bars, drive-throughs, auto sales and self-storage usually need a CUP.
For industrial sites near homes, test the setbacks, loading orientation and outdoor storage screening.
Work through our commercial due diligence checklist.

Questions people ask

Can I build a single-story retail building in MU-1?

Usually not. MU-1 sets a minimum of 2 stories, 25 ft and 1.0 FAR, though the minimum FAR can drop to 0.85 for a demonstrated hardship.

Which industrial zone allows outdoor storage yards?

I-2, where outdoor storage, equipment rental and building material yards are permitted as primary uses. In L-I, outdoor storage is accessory only.

Do specific plans override the zoning code?

Within their boundaries, specific plans regulate development much like zoning, and Title 20 fills in anything the plan doesn’t cover.

What’s changing in the Creek District?

The city is updating the 2007 Creek Specific Plan. A final draft went to the Planning Commission in late October 2026.

How tall can commercial buildings be?

60 ft and 5 stories in C, 35 ft in OP and 27 ft in NC. Mixed-use zones go up to 60 ft in MU-2.

Can a hotel go in a business park?

Hotels need a CUP in B-P and OP. In the C zone, hotels with 50 or more rooms are permitted.

Does Diamond handle commercial property in San Marcos?

Contact Matthew Martinez to talk through buying, selling or leasing commercial property in San Marcos.

Sources & notes

This page is general information, not legal or tax advice. Last reviewed October 2026 by Matthew Martinez.

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