21671 Gateway Center Dr
Diamond Bar, CA 91765 Walnut Valley

Suite 101 is an 871 SF, fully built-out first-floor office in the prestigious Gateway Center at 21671 Gateway Center Drive in Diamond Bar, offered on a Modified Gross lease at $2.30/SF/MO. The suite is designed for immediate occupancy and includes three private offices, a dedicated conference room, five open workstations, and a professional reception area. Large windows flood the space with natural light and look out over the well-maintained corporate park. Interior finishes include hardwood flooring, fresh modern paint, and central HVAC on a dedicated electric meter — so unlike full-service buildings that shut climate control off at 6 PM, you control your own heat and air around the clock. The landlord covers water, trash, property taxes, property insurance, CAM, and landscaping; tenant carries liability insurance, electric, and data (Spectrum high-speed available). The suite has CCTV monitoring on the floor and benefits from 24/7 secured building access, on-site property management, and ample surface parking. Ideal for professional services firms (legal, accounting, consulting, insurance), medical practices, tech startups, or a regional satellite office.

Quick facts to mirror in the structured fields
•	Size: 871 SF · 1st Floor · Office
•	Rate: $2.30/SF/MO · $27.60/SF/YR · $2,003.30/MO · $24,039.60/YR
•	Lease term: 2–5 years · Available: Now
•	Build-out: Full · Condition: Excellent
•	3 private offices · 1 conference room · 5 workstations · ~8' finished ceilings
•	Central HVAC · After-hours HVAC available · Hardwood floors · CCTV
•	Fits ~2–5 people

• Date available: Now
• Lease term: 2 - 5 Years
• Service type: Modified Gross
• Built out as: Professional Services
• Space Type: Relet

Suite 109 is one of the most desirable units in the building — a 944 SF corner office on the first floor with sweeping views toward the surrounding mountains and the SR-57 / SR-60 corridor, offered on a Modified Gross lease at $2.30/SF/MO. Freshly painted with contemporary finishes, the suite features four generously sized private offices, a dedicated conference room, a print/copy room, and six workstations — a strong fit for a small professional services firm, medical practice, or growing regional team. Hardwood flooring runs throughout, large windows fill the space with natural light, and central HVAC runs on a dedicated electric meter so the tenant controls climate 24/7 — a meaningful upgrade over full-service buildings in the area that shut HVAC off at 6 PM during Diamond Bar's hot summers. The landlord covers water, trash, property taxes, property insurance, CAM, and landscaping; tenant carries liability insurance, electric, and high-speed internet (Spectrum service available). Building amenities include on-site property management, controlled access, 24/7 secured entry, and abundant surface parking for tenants and visitors. The Gateway Center address puts you less than a mile from the SR-57 / SR-60 interchange and within ~15 miles of Ontario International Airport — ideal for any tenant needing easy regional access.

Quick facts to mirror in the structured fields
•	Size: 944 SF · 1st Floor · Office · Corner Space
•	Rate: $2.30/SF/MO · $27.60/SF/YR · $2,171.20/MO · $26,054.40/YR
•	Lease term: 2–5 years · Available: Now
•	Build-out: Full · Condition: Excellent · Mountain views
•	4 private offices · 1 conference room · 6 workstations · print/copy room
•	Central heating · After-hours HVAC · Hardwood floors · Safe and secure
•	Fits ~2–5 people

• Date available: Now
• Lease term: 2 - 5 Years
• Service type: Modified Gross
• Built out as: Standard Office
• Space Type: Relet

Suite description

Suite 203 is a 909 SF second-floor office in the prestigious Gateway Center at 21671 Gateway Center Drive, Diamond Bar, offered on a Modified Gross lease at $2.30/SF/MO. The suite is positioned to take advantage of the building's elevated views and natural light, with central HVAC running on a dedicated electric meter — so the tenant controls climate around the clock, a real advantage over full-service buildings in the area that shut AC off at 6 PM during hot Diamond Bar summers. The landlord covers water, trash, property taxes, property insurance, CAM, and landscaping; tenant carries liability insurance, electric, and high-speed internet (Spectrum service available throughout the building). Tenants enjoy on-site property management, controlled-access entry, 24/7 secured access, and ample surface parking. The location places you less than a mile from the SR-57 / SR-60 interchange, with quick connections to I-10, I-210, Orange County, and San Bernardino County — and about 15 miles from Ontario International Airport. Diamond Bar's affluent demographics, low crime rate, and top-tier school district (Walnut Valley Unified) make the address a strong fit for professional services firms, medical practices, tech startups, or regional satellite offices looking for a polished, accessible Tri-County address at a sub-market rate.

Quick facts to mirror in the structured fields
•	Size: 909 SF · 2nd Floor · Office
•	Rate: $2.30/SF/MO · $27.60/SF/YR · $2,090.70/MO · $25,088.40/YR
•	Lease term: 2–5 years · Available: Now

• Date available: Now
• Lease term: 2 - 5 Years
• Service type: Modified Gross
• Built out as: Standard Office
• Space Type: Relet