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Active
ActiveWaterfront · Condominium
$24,350,000$3,898 / sqft
300 N Biscayne Blvd, Miami FL 33132
Listed
4
Bedrooms
6
Bathrooms
6,247 sqft
Interior
2028
Year built
$8,246 / mo
HOA
Condominium
Type
About this home
BILLIONAIRE NEIGHBOR ALERT: Live Next Door to Ajay Gupta in Miami's Ultimate Mansion in the Sky. Penthouse 401 at Waldorf Astoria Residences Miami — a half-floor sky mansion in Cube 9, beside Ajay Gupta's own residence at the very top of the Penthouse Collection. 6,597 SF, 4 BR / 5.5 BA, private elevator, 13-foot ceilings, private pool, and 613 SF Sky Conservatory. Sweeping NE views of Miami Beach, Biscayne Bay, the Atlantic, and the downtown skyline. BAMO interiors. Wolf & Sub-Zero. Italian cabinetry. Exclusive 5-star beach club with Major Food Group, helicopter access, Peacock Alley, Michelin-star dining. Imagine living next to Ajay Gupta — the ultimate proximity — for under $25M. Truly a one-of-a-kind mansion in the sky. Offered at $24,350,000. 96% sold. Topping off now, completion early 2028.
Features
- Built-in Features
- Cooking Island
- Elevator
- Fire Sprinklers
- Entrance Foyer
- Walk-In Closet(s)
- Den/Library/Office
- Storage
- Utility Room/Laundry
- Open Balcony
- Bay
Run the numbers
We fill in the price and the building's HOA dues. That leaves tax, insurance and maintenance — they depend on your exemptions, your insurer and the unit, so we don't guess them. Rent starts from what comparable units are asking nearby. Vacancy and the loan terms below start at common defaults; change them.
Median asking rent for 4-bed rentals in Brickell, from 18 active listings; the middle half ask $18,000–$29,000.That is what landlords ask, not what units let for — edit it if you know better.
Our default, not a market figure
From the listing
Depends on assessed value & exemptions
Varies widely by building
Repairs, turnover, management
Cap rate
Cash-on-cash
Monthly cash flow
Net operating income
Enter property tax, insurance, maintenance to see the returns. A cap rate calculated without every cost overstates the deal — often by half — so we don't show a partial one.
Illustration only — not a loan offer, quote, or investment advice. We are not a lender and neither offer nor arrange financing. The loan fields start at 20% down over 30 years at 6.5% (rates as of July 2026); that is a nominal rate for illustration, not an APR, and your actual terms will differ. Cap rate is unlevered; cash-on-cash counts the down payment as invested capital and excludes closing costs.
Listing data from the MIAMI Association of REALTORS® (MIAMIRE) IDX program. Information deemed reliable but not guaranteed. Demo data shown for layout purposes.