
3516 21ST AVENUE S, ST PETERSBURG, FL, 33711
Active55 days on marketListed Jun 19, 2026MLS #TB8516916
About this home
3516 21ST AVENUE S
NEW 2026 BUILD! Welcome home to this luxury estate featuring 4 bedrooms plus an office, 2.5 baths, and a detached 2-bedroom, 1-bath guest house, all situated on an expansive third-of-an-acre lot designed to provide privacy between both residences. Built by McDew Development, this unique property offers luxury living, exceptional flexibility, and income-producing potential in one of St. Petersburg’s fastest-growing areas. The striking modern exterior showcases custom white stucco, dark architectural accents, and black impact-rated windows and doors. A welcoming front porch leads to an open-concept interior featuring soaring ceilings, luxury vinyl plank flooring, wide baseboards, recessed lighting, and designer finishes throughout. Expansive sliders open to a private, fully fenced backyard with ample room for a resort-style pool. At the heart of the home, the chef’s kitchen features a waterfall island, floor-to-ceiling two-tone wood cabinetry, quartz countertops, built-in cooktop, wall oven, wall microwave, counter-depth refrigerator, and a spacious walk-in pantry with additional storage and prep space. The first-floor primary suite offers custom walk-in closets and a spa-inspired bath with a soaking tub, oversized shower, floating double vanity, and private water closet. A dedicated office completes the main level. Upstairs, three additional bedrooms surround a spacious loft-style great room with a wet bar, ideal for entertaining or relaxing. Adding tremendous value is the detached 800 SF ADU, complete with 2 bedrooms, 1 bath, a full kitchen, living area, laundry, and private balcony. Whether used for rental income, multigenerational living, or extended guests, this fully self-contained residence provides versatility rarely found in new construction. The property is completed by an oversized 3-car garage with alley access and is conveniently located minutes from Downtown St. Petersburg, the St. Pete Pier, Gulfport, Tropicana Field, and I-275. Situated outside a flood zone and custom built in 2026, this is a rare opportunity to own a private modern luxury retreat with both lifestyle and investment appeal.
Facts & features
The home at a glance
4
Bedrooms
2.5
Bathrooms
3,345
Sqft
0.31 ac
Lot size
3
Garage
2026
Year built
Two
Levels
$374
Per sqft
Inside
Outside & construction
Community & fees
Utilities & systems
The numbers
What it really costs
Built from this home's actual numbers — the most recent property-tax bill on record — not generic estimates.
$7,537 /mo · 10% down Conventional, 30-yr fixed at 6%
The assumptions
Above the FHA loan limit for our service areas, so Conventional is the default. VA buyers: switch below — $0 down.
These numbers assume a generic buyer — your credit, down payment and loan program change them. Get the real quote in minutes:

Andrew Acosta
Acosta Home Loans with PRMG · NMLS #1468866
Run your own numbers
FHA isn’t available at this price — the loan would exceed the $541,287 FHA limit for our service areas.
Estimated payment
$7,537/mo
Includes estimated PMI — it drops off once you reach 20% equity. Taxes reflect the most recent bill on record; insurance is a typical-Florida estimate. Your lender’s numbers will differ. CENTURY 21 Edge partners with Florida’s best lenders.
Value check
Is the price right?
The internet’s favorite home-value number comes from a single automated model that has never seen the street, the finishes, or the view — which is why it routinely misses by tens of thousands of dollars. The edgeAI estimate combines multiple independent data sources with our team’s on-the-ground expertise in this exact market.
vs edgeAI estimate
−24.5%
$/sqft vs St Petersburg actives
$374 vs $336
Days on market
55 vs 57 typical
Where $374/sqft sits among the 400 St Petersburg actives
The edgeAI estimate is a starting point, not an appraisal or a broker price opinion. It is generated from public records, listing data and market modeling, and is subject to change once a licensed real estate professional personally inspects the property. Condition, floor, view and lot are not fully captured by any model — ask us for a full comparative market analysis.
Where it sits
Inside Childs Park
Drive times from this address
Estimated driving times, typical traffic. Data © OpenStreetMap contributors.
Get to know St Petersburg. See the full St Petersburg guide →
Childs Park — neighborhood snapshot
Population
6,497
Median age
38
Median income
$42,874
Median home value
$170,059
Avg household
3
Households w/ children
782
For the school run
Pinellas County School District
School assignments and ratings via edgeAI — always verify with the district.
The numbers that matter
The St Petersburg market
$380K → $402K
St Petersburg median sold, yr/yr
95.8%
Sale-to-list ratio (12 mo)
226 of 400
St Petersburg actives have cut their price
Median sold price, St Petersburg, trailing 36 months (3-month rolling) · live MLS data.
This home is listed 300% above the ST PETERSBURG 33711 median. See the full St Petersburg market guide →
Paper trail
This home's history
Reality check
What actually sold near 3516 21ST AVENUE S
Asking prices are opinions — closed sales are facts. The most comparable homes that actually changed hands nearby in the last twelve months.
Sold · Dec ’25$357,000
3680 19TH AVENUE S · same community
4 bd · 2 ba · 1,982 sqft · $180/sqft · 124 DOM
Sold · Aug ’25$239,000
3720 18TH AVENUE S · same community
3 bd · 2 ba · 1,248 sqft · $192/sqft · 26 DOM
Sold · Feb ’26$290,000
3828 18TH AVENUE S · same community
4 bd · 2 ba · 1,248 sqft · $232/sqft · 39 DOM
Closed-sale data from the MLS, last 12 months, selected for similarity in size and location. No two homes are identical — ask us for a full comparative analysis.
Your home team
The pros in your corner
Buying a home is two conversations — the home and the money. Here’s who handles each, side by side, already working together.
Your agent
David Ramirez
Real Estate Agent · CENTURY 21 Edge
Tours, negotiation, and every question about 3516 21ST AVENUE S — start here.

Your lender
Andrew Acosta
Acosta Home Loans with PRMG · NMLS #1468866
Pre-approval, rates, and the real monthly number for 3516 21ST AVENUE S — before you fall in love.
See it in person
Schedule a tour
Pick a day that works — this goes straight to David's phone and CRM.
Straight answers
3516 21ST AVENUE S FAQs
What would the monthly payment be for 3516 21ST AVENUE S?+
With 10% down on a 30-year Conventional loan at 6%, the all-in payment lands around $7,537/mo — principal and interest, the actual property-tax bill and typical Florida insurance. The payment calculator on this page lets you switch loan type (FHA, Conventional, VA) and adjust the down payment, rate and term.
What are the property taxes on 3516 21ST AVENUE S?+
The most recent tax bill on record (2025) was $1,959. A new owner's bill can differ once the sale price resets the assessed value — we can walk you through what to expect.
How does the price compare to other homes in St Petersburg?+
At $1,250,000, this home is listed about 191% above the St Petersburg median of $430,000. The market section on this page shows how the area is trending.
Which schools are assigned to 3516 21ST AVENUE S?+
Gulfport Montessori Elementary School (elementary), Boca Ciega High School (high), Azalea Middle School (middle) — Pinellas County School District. Always verify school assignments with the district before relying on them.
Keep looking
Similar homes nearby
Listing courtesy of EXP REALTY LLC · Peter Bonanno. MLS #TB8516916.
IDX information is provided exclusively for consumers’ personal, non-commercial use and may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing. Data is deemed reliable but is not guaranteed accurate by Stellar MLS.
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