B
BlueBay Brokers
Investment Analysis
Social preview card
Investment Analysis · South Beach

Boulan South Beach #303

220 21st Street #303, Miami Beach FL 33139 · MLS A12005918 · Active
★ STR-permitted condo-hotel — a true nightly Airbnb play
$670K
List price
$673
$ / sqft
1 / 1.5
Bed / bath
995
Sq ft
$2,381
HOA / mo
~3.7%
Net cap (STR)
The property

A turnkey, rental-unrestricted 1BR in the heart of South Beach

Unit #303 is a 1-bed, 1.5-bath of 995 sq ft on the 3rd floor of Boulan South Beach, a 2010 boutique condo-hotel two blocks from the sand on 21st Street. It has a private balcony over the park, impact glass, tile floors, one assigned parking space, and is sold turnkey — already run by a third-party short-term-rental operator.

The decisive feature for an investor is the lease policy: no rental restrictions, 1-day minimum, 365 leases per year. Unlike most Miami condos, this is a genuine nightly Airbnb asset, legal for true short-term rental. List price $670,000 ($673/sf), HOA $2,381/mo (covers water, cable, A/C maintenance, common areas), 2025 taxes $10,242 (no homestead). Building amenities: heated pool, sauna, bar, clubroom, doorman. Flood zone AE — flood insurance required.

Market valuation

What the building's comps say

Boulan trades thinly. The recent set holds just one true closed sale: unit #310 (1,000 sq ft) sold for $610,000 ($610/sf) at 96% of list. The subject asks $673/sf, above that trade. The higher ocean-view #507 line was listed at $1.2–1.3M and failed to sell (expired), and #310 itself first listed at $650K before trading lower.

UnitSq ftStatusPrice$/sf
#303 (subject)995Active$670,000$673
#3101,000Closed$610,000$610
#405856Active$599,000$700
#3101,000Expired$650,000$650
#507 (ocean view)1,000Expired$1.2–1.3M$1,200+
Estimated fair market value
$610,000 – $640,000

Anchored on the lone closed sale ($610/sf), with a small premium for #303's impact glass and park balcony. The $670,000 ask is ~5–9% above that trade — modest negotiation room, though a one-sale comp set limits confidence.

HOA and taxes here are normalized across the Boulan comp set ($2.38/sqft/mo and $10.24/sqft/yr), which confirms the listing's $2,381/mo HOA and $10,242 tax (≈$2,371/mo and $10,185/yr at 995 sq ft). Verify with the association and on the folio.

STR economics

The nightly-rental math

Modeled at your assumptions: $330 ADR and 80% occupancy, i.e. ~$96,000 gross revenue. Resort/tourist taxes on nightly stays are collected from guests (pass-through) and not counted as owner income or cost. Management is modeled at 20% of gross, consistent with full-service condo-hotel operators.

LineAnnual
Gross revenue ($330 ADR × 80% × 365)$96,360
HOA ($2,381/mo)−$28,572
Property tax (2025)−$10,242
Management (20% of gross)−$19,272
Insurance + flood (AE zone)−$3,500
Utilities, internet, supplies−$4,700
Furniture amortization + maintenance−$5,000
Net operating income~$25,000
At $670,000 / 80% occupancy
~3.7% net cap · ~14.4% gross yield

A strong gross for a 1-bedroom, driven by the nightly-rate flexibility most Miami condos can't offer.

The catch: occupancy sensitivity

The ~$2,381/mo HOA is a heavy fixed cost, so the return swings hard with occupancy. The 80% assumption is well above the Miami Beach STR market average (~51%), so treat it as a strong, professionally-managed scenario — not a floor.

OccupancyGrossNOINet cap
80% (your base)$96,360$25,074~3.7%
70%$84,315$15,438~2.3%
60% (near market avg)$72,270$5,802~0.9%
Risks & considerations

What to weigh before offering

Headwinds

  • Very high HOA (~$2,381/mo) — the dominant cost; verify reserves and any special assessments.
  • 80% occupancy is optimistic vs the ~51% Miami Beach market average; returns fall fast below it.
  • Condo-hotel + flood zone AE narrows the resale/financing buyer pool.
  • Management fee (modeled 20%) materially moves NOI — confirm the operator's actual terms.

Tailwinds

  • No rental restrictions, 1-night minimum — a genuine, legal Airbnb in South Beach (rare).
  • Turnkey and already professionally managed — immediate cash flow.
  • Two blocks from the beach; impact glass; assigned parking; full amenities.
  • Fresh listing (30 DOM) at original price — room to build a case over time.
Bottom line

A real Airbnb play — if occupancy holds

Boulan #303 offers something most Miami condos can't: unrestricted nightly rental, turnkey and managed. At your $330 ADR / 80% occupancy it pencils to ~3.7% net (14% gross), a healthy figure for a 1-bedroom. The entire thesis rests on keeping occupancy high against a heavy HOA — so the decision hinges on validating the operator's real booking history. Get the trailing-12-month revenue and management terms, and this becomes a clear yes/no.

BlueBay Brokers

Want the real booking history?

I can request the operator's trailing-12-month revenue, verify the HOA reserves, and structure an offer.

Talk to Steve →