100 Cape Florida Dr
Key Biscayne, FL 33149 · single_family · For Sale · 239 days on market
Asking price$19,800,000
4 beds 9 baths 8,240 sqft
Suggested offer$10,917,341$8,882,659 above the est. market value of $10,917,341.
View on Realtor.com →Listed by Lucia Marin · One Sotheby's International Realty
Typesingle_family
Built2007
Price / sqft$2403
Est. value (own analysis)$10,917,341
Rent estimate (own analysis)$15,700/mo
HOANone
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Statusfor_sale
Listed date2026-01-06
Removed date—
MLSMiamiMLS #A11934196
Coordinates25.68314, -80.16141
Address100 Cape Florida Dr
CityKey Biscayne
StateFL
Zip33149
Listing ID6257108828
Sourceus-real-estate-listings, cached 2026-08-31
ZIP market snapshot (33149)
Typical home value (ZHVI)$1,692,135
Typical rent (ZORI)$7,910/mo
Zillow Research's ZHVI (home value index) and ZORI (rent index) for this ZIP, as of 2026-07 — free published data, refreshed monthly, no RentCast quota spent. "Typical value/rent" is a smoothed index, not a literal median of active listings.
Underwriting (buy-and-hold, default assumptions)
| Acquisition (one-time, not monthly/yearly) | |
| Purchase price | $19,800,000 |
| Down payment (20.0%) | $3,960,000 |
| Loan amount | $15,840,000 |
| Closing costs (5.0%) | $990,000 |
| Total cash to close | $4,950,000 |
| Income | |
| Rent (comp-derived) | $15,700$188,400 |
| Vacancy loss (8.0%) | |
| Effective gross income | $14,444$173,328 |
| Operating expenses | |
| Property tax (placeholder 1.9% of price) | $31,350$376,200 |
| Insurance (placeholder 0.8% of price) | $13,200$158,400 |
| HOA dues | $0$0 |
| Management (0.0% of EGI) | $0$0 |
| Maintenance (5.0% of GSR) | $785$9,420 |
| Total operating expenses | $45,335$544,020 |
| Net operating income (NOI) | |
| Debt service & reserves | |
| Debt service (6.66%, avg 30yr rate as of 2026-08-27, 30yr amortizing) | |
| CapEx reserve (5.0% of GSR) | $785$9,420 |
| Mortgage insurance (PMI) (0.0% of loan, not required — down payment ≥ 20%) | $0$0 |
| Cash flow |
Cap rate
Cash-on-cash
DSCR
Rent-to-price (1% rule)
Gross rent multiplier
Operating expense ratio
Break-even occupancy
Comparables
Same ZIP. Real active rental listings, used to derive the rent estimate above.
| Address | Type | Beds | Baths | Sqft | Asking rent | Listed | Days on market |
|---|---|---|---|---|---|---|---|
| single_family | 4 | 3 | 2,749 | $19,000 | 2026-08-25 | — | |
| single_family | 4 | 2 | 2,175 | $13,500 | 2026-02-09 | — | |
| single_family | 4 | 3 | 2,112 | $12,500 | 2026-02-04 | — | |
| single_family | 4 | 3 | 2,196 | $16,500 | 2026-07-24 | — | |
| single_family | 4 | 5 | 3,202 | $31,500 | 2026-07-24 | — | |
| single_family | 4 | 3 | 2,316 | $14,900 | 2026-06-27 | — | |
| single_family | 4 | 4 | 3,006 | $18,900 | 2026-07-29 | — | |
| single_family | 4 | 3 | 2,406 | $19,000 | 2026-05-29 | — | |
| single_family | 4 | 3 | 1,798 | $13,500 | — | — | |
| single_family | 4 | 3 | 1,979 | $10,900 | 2026-08-10 | — |
Same ZIP & bedroom count. Closed sales from Realtor.com over the last 12 months, matched to this property's type — real transaction prices, not asking prices. Falls back to Miami-Dade County public records (property appraiser tax roll) when Realtor.com has no sales on file for the area.
| Address | Type | Beds | Baths | Living sqft | Sale price | Sale date |
|---|---|---|---|---|---|---|
| 301 Hampton Ln | single_family | 4 | 3 | 2,068 | $3,100,000 | 2026-08-24 |
| 591 N Mashta Dr | single_family | 4 | 5 | 4,290 | $14,000,000 | 2026-08-03 |
| 217 Buttonwood Dr | single_family | 4 | 3 | 2,503 | $3,500,000 | 2026-06-23 |
| 401 Warren Ln | single_family | 4 | 3 | 2,958 | $3,000,000 | 2026-04-20 |
| 465 Hampton Ln | single_family | 4 | 4 | 3,666 | $4,475,000 | 2026-04-10 |
| 760 Glenridge Rd | single_family | 4 | 6 | 4,142 | $625,000 | 2026-04-09 |
| 315 Palmwood Ln | single_family | 4 | 5 | 3,297 | $4,400,000 | 2026-04-08 |
| 285 W Enid Dr | single_family | 4 | 3 | 3,436 | $4,200,000 | 2026-04-02 |
| 340 Ridgewood Rd | single_family | 4 | 3 | 2,699 | $3,550,000 | 2026-03-12 |
| 600 Allendale Rd | single_family | 4 | 4 | 2,775 | $3,500,000 | 2026-01-16 |
| 361 W Heather Dr | single_family | 4 | 3 | 1,570 | $2,600,000 | 2025-09-19 |
| 92 W Mashta Dr | single_family | 4 | 3 | 2,403 | $3,230,000 | 2025-09-12 |
Same ZIP. Other properties currently for sale nearby — asking prices, not closed sale prices. Not a price comp; see Sold comps for actual transaction history.
| Address | Type | Beds | Baths | Sqft | Asking price | Days on market |
|---|---|---|---|---|---|---|
| 200 Ocean Lane Dr Apt 501 | condos | 4 | 4 | 1,880 | $3,850,000 | — |
| 201 Crandon Blvd Apt 174 | townhomes | 4 | 6 | 3,254 | $5,100,000 | — |
| 255 Ridgewood Rd | single_family | 4 | 3 | 2,177 | $3,550,000 | — |
| 161 Cape Florida Dr | single_family | 4 | 6 | 6,661 | $14,990,000 | — |
| 640 S Mashta Dr | single_family | 4 | 4 | 3,620 | $16,800,000 | — |
| 631 N Mashta Dr | single_family | 4 | 5 | 2,255 | $18,500,000 | — |
| 445 Grand Bay Dr Apt 303 | condos | 4 | 5 | 3,480 | $3,850,000 | — |
| 350 E Ocean Dr Unit 301N | condos | 4 | 7 | 3,798 | $8,950,000 | — |
10-year hold projection
IRR-11.6%
Equity multiple-0.99x
Total return (10yr)-$7,260,891
| Year | Property value | NOI | Cash flow | Loan balance | Equity |
|---|---|---|---|---|---|
| 1 | $20,394,000 | -$370,692 | -$1,601,617 | $15,668,259 | $4,725,741 |
| 2 | $21,005,820 | -$379,093 | -$1,610,253 | $15,484,725 | $5,521,095 |
| 3 | $21,635,995 | -$387,677 | -$1,619,080 | $15,288,587 | $6,347,408 |
| 4 | $22,285,074 | -$396,450 | -$1,628,099 | $15,078,980 | $7,206,095 |
| 5 | $22,953,627 | -$405,414 | -$1,637,317 | $14,854,979 | $8,098,648 |
| 6 | $23,642,235 | -$414,574 | -$1,646,737 | $14,615,596 | $9,026,640 |
| 7 | $24,351,503 | -$423,934 | -$1,656,363 | $14,359,774 | $9,991,729 |
| 8 | $25,082,048 | -$433,497 | -$1,666,200 | $14,086,384 | $10,995,664 |
| 9 | $25,834,509 | -$443,269 | -$1,676,252 | $13,794,221 | $12,040,289 |
| 10 | $26,609,544 | -$453,253 | -$1,686,522 | $13,481,994 | $13,127,550 |
Assumes 3.0% annual rent growth, 2.5% expense growth, 3.0% appreciation, and a 6.0% selling cost at exit — all placeholder assumptions, not market-derived.