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21388 Marina Cove Cir Apt 13G

Aventura, FL 33180 · townhomes · For Sale · 466 days on market
Asking price$850,000
4 beds 4 baths 2,646 sqft
Suggested offer$735,000$115,000 above the est. market value of $735,000.
View on Realtor.com →
Listed by Silvia Chudnovsky · Coldwell Banker Realty
Typetownhomes
Built1990
Price / sqft$321
Est. value (own analysis)$735,000
Rent estimate (own analysis)$6,700/mo
HOA$1,184/mo
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Neighborhood

Show every detail
Statusfor_sale
Listed date2025-05-24
Removed date—
MLSMiamiMLS #A11809333
Coordinates25.97291, -80.13055
Address21388 Marina Cove Cir Apt 13G
CityAventura
StateFL
Zip33180
Listing ID9907768802
Sourceus-real-estate-listings, cached 2026-09-02

ZIP market snapshot (33180)

Typical home value (ZHVI)$463,036
Typical rent (ZORI)$3,210/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$850,000
Down payment (20.0%)$170,000
Loan amount$680,000
Closing costs (5.0%)$42,500
Total cash to close$212,500
Income
Rent (comp-derived)$6,700$80,400
Vacancy loss (8.0%)

Vacancy Loss

Gross Scheduled Rent × Vacancy Rate

Gross scheduled rent (annual) comp$80,400
Vacancy rate (assumption) assumption8.0%

$80,400 × 8.0% = $6,432

Effective gross income$6,164$73,968
Operating expenses
Property tax (placeholder 1.9% of price)$1,346$16,150
Insurance (placeholder 0.8% of price)$567$6,800
HOA dues$1,184$14,208
Management (0.0% of EGI)$0$0
Maintenance (5.0% of GSR)$335$4,020
Total operating expenses$3,432$41,178
Net operating income (NOI)

Net Operating Income (NOI)

Effective Gross Income − Total Operating Expenses

Effective gross income derived$73,968
Total operating expenses derived$41,178

$73,968 − $41,178 = $32,790

Debt service & reserves
Debt service (6.66%, avg 30yr rate as of 2026-08-27, 30yr amortizing)

Monthly Principal & Interest

Standard amortization on the loan amount, at the effective rate and term

Loan amount derived$680,000
Interest rate (avg 30yr rate) comp6.7%
Term (assumption) assumption30 years

$680,000 amortized at 6.7% over 30 years = $4,370/mo

CapEx reserve (5.0% of GSR)$335$4,020
Mortgage insurance (PMI) (0.0% of loan, not required — down payment ≥ 20%)$0$0
Cash flow

Monthly Cash Flow

(NOI − Annual Debt Service − Annual CapEx Reserve − Annual PMI) ÷ 12

NOI derived$32,790
Annual debt service derived$52,438
Annual CapEx reserve assumption$4,020
Annual PMI assumption$0

($32,790 − $52,438 − $4,020 − $0) ÷ 12 = -$1,972

Cap rate

Cap Rate

NOI ÷ Purchase Price

NOI derived$32,790
Purchase price data$850,000

$32,790 ÷ $850,000 = 3.9%

Cash-on-cash

Cash-on-Cash Return

Annual Cash Flow ÷ Total Cash Invested

Annual cash flow derived-$23,668
Total cash to close derived$212,500

-$23,668 ÷ $212,500 = -11.1%

DSCR

Debt Service Coverage Ratio (DSCR)

NOI ÷ Annual Debt Service

NOI derived$32,790
Annual debt service derived$52,438

$32,790 ÷ $52,438 = 0.63

Rent-to-price (1% rule)

Rent-to-Price (the "1% rule")

(Gross Scheduled Rent ÷ 12) ÷ Purchase Price

Gross scheduled rent (annual) comp$80,400
Purchase price data$850,000

($80,400 ÷ 12) ÷ $850,000 = 0.8%

Gross rent multiplier

Gross Rent Multiplier (GRM)

Purchase Price ÷ Gross Scheduled Rent

Purchase price data$850,000
Gross scheduled rent (annual) comp$80,400

$850,000 ÷ $80,400 = 10.6

Operating expense ratio

Operating Expense Ratio

Total Operating Expenses ÷ Effective Gross Income

Total operating expenses derived$41,178
Effective gross income derived$73,968

$41,178 ÷ $73,968 = 55.7%

Break-even occupancy

Break-Even Occupancy

(Total OpEx + Annual Debt Service + Annual PMI) ÷ Gross Scheduled Rent

Total operating expenses derived$41,178
Annual debt service derived$52,438
Annual PMI assumption$0
Gross scheduled rent (annual) comp$80,400

($41,178 + $52,438 + $0) ÷ $80,400 = 116.4%

Comparables

Same ZIP. Real active rental listings, used to derive the rent estimate above.

AddressTypeBedsBathsSqftAsking rentListedDays on market
townhomes442,406$6,7002026-07-06—
townhomes442,700$6,2502026-06-10—
townhomes453,292$15,0002026-06-12—

21391 Marina Cove Cir Apt 14K

Aventura, 33180 · rent comp

Bedrooms / bathrooms4 bd / 4 ba
Square footage2,406
Listed2026-07-06
Days on market—

Asking rent: $6,700

View on Zillow →

21399 Marina Cove Cir Unit M12

Aventura, 33180 · rent comp

Bedrooms / bathrooms4 bd / 4 ba
Square footage2,700
Listed2026-06-10
Days on market—

Asking rent: $6,250

View on Zillow →

3750 Yacht Club Dr Unit TH5

Aventura, 33180 · rent comp

Bedrooms / bathrooms4 bd / 5 ba
Square footage3,292
Listed2026-06-12
Days on market—

Asking rent: $15,000

View on Zillow →

Widened to any bedroom count in ZIP. 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.

AddressTypeBedsBathsLiving sqftSale priceSale date
2991 NE 185th St Apt 1706townhomes431,481$535,0002026-08-24
19220 NE 25th Ave Unit 271Btownhomes331,688$400,0002026-07-16
20200 W Country Club Dr Apt 112townhomes331,330$350,0002026-07-13
3525 Magellan Cir Apt 626townhomes331,707$720,0002026-07-08
21204 Harbor Way Unit 122-12townhomes231,250$475,0002026-07-01
20350 W Country Club Dr Apt 123townhomes331,330$312,5002026-06-15
20350 W Country Club Dr Unit 120-4townhomes331,330$270,0002026-06-10
21160 Mainsail Cir Apt H12townhomes331,520$625,0002026-06-10
21399 Marina Cove Cir Apt 14townhomes442,700$750,0002026-06-09

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.

AddressTypeBedsBathsSqftAsking priceDays on market
19694 NE 24th Avesingle_family442,863$2,580,000—
2616 NE 214th Stsingle_family44899$489,000—
19885 NE 22nd Avesingle_family443,898$1,775,000—
2627 NE 213th Stsingle_family421,473$899,900—
19731 NE 24th Avesingle_family443,228$2,395,000—
19667 Turnberry Way Apt 20GRcondos443,426$1,900,000—
2511 NE 209th Tersingle_family452,150$2,150,000—
2301 NE 196th Stsingle_family442,668$1,850,000—

10-year hold projection

IRR2.9%
Equity multiple1.47x
Total return (10yr)$210,762
YearProperty valueNOICash flowLoan balanceEquity
1$875,500$32,790-$23,668$672,627$202,873
2$901,765$33,980-$22,579$664,748$237,017
3$928,818$35,210-$21,452$656,328$272,490
4$956,682$36,483-$20,285$647,330$309,352
5$985,383$37,799-$19,077$637,714$347,669
6$1,014,944$39,160-$17,827$627,437$387,507
7$1,045,393$40,568-$16,532$616,455$428,937
8$1,076,755$42,024-$15,193$604,719$472,036
9$1,109,057$43,529-$13,807$592,177$516,881
10$1,142,329$45,086-$12,373$578,773$563,556
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.
All figures are estimates for evaluation purposes only, not investment, tax, legal, or insurance advice. Property tax is estimated from a real matched tax bill or millage rate when available, a placeholder % of price otherwise; insurance is scaled by flood and wind risk where those are known and a flat percentage otherwise — never a real quote. Verify all of them, along with association restrictions and permit status, before committing capital. Rent estimates come from real comps or Zillow’s ZIP index, not appraisals.