Question: Which man-made island in Biscayne Bay, Florida, United States is home to Thomas Kramer, a German-born real estate developer and venture capitalist?

Context paragraphs:
Soldier Key: Soldier Key is an island in Biscayne National Park in Miami-Dade County, Florida.  It is located between Biscayne Bay and the Atlantic Ocean, about three miles north of the Ragged Keys, five miles south of Cape Florida on Key Biscayne, seven-and-a-half miles east of the mainland and three miles west of Fowey Rocks.  It lies on the Safety Valve, a sand bar that separates Biscayne Bay from the Atlantic Ocean and moderates storm surges into the bay.  The island is small, about 200 yards (200 meters) by 100 yards (100 meters) with a maximum elevation of six feet (under two meters).  It is at the southern end of the along-shore movement of sand that feeds the barrier islands to the North (such as Key Biscayne) and is the northernmost exposure of the Key Largo limestone (fossilized coral reef) which forms the "true" Florida Keys.  The island is covered by grass and shrub vegetation typical of the Florida Keys.  Although the island was described as "thickly wooded" in 1894, as of 1955 the only wooded areas were mangroves on the fringes of the island.  Also as of 1955, there were several buildings on the island, and a boat slip protected by jetties.

The Mark on Brickell: The Mark on Brickell is a residential high-rise building located in the Brickell district of Downtown Miami, Florida, United States.  Standing at 420 feet (128 meters), the building is currently the 46th-tallest building in the city (as of May 2008).  The building is directly on the Biscayne Bay waterfront and its address is 1155 Brickell Bay Drive.  The Mark on Brickell houses 36 floors, and was completed in 2001.  The building's developer was Thomas Kramer's Portofino Group in partnership with the Related Group of Florida.

Hibiscus Island: Hibiscus Island is a neighborhood of South Beach in the city of Miami Beach on a man-made island in Biscayne Bay, Florida, United States.  Hibiscus Island lies just north of Palm Island.  It is an exclusive residential neighborhood with relatively high property values.  The island is accessible via the MacArthur Causeway.

San Marino Island: San Marino Island is a neighborhood of South Beach in the city of Miami Beach on a man-made island in Biscayne Bay, Florida, United States.  It is one of the Venetian Islands, a chain of artificial islands in Biscayne Bay in the cities of Miami and Miami Beach.  It is between San Marco Island and Di Lido Island.  It is home to residential neighborhoods and a portion of the Venetian Causeway.

900 Biscayne Bay: 900 Biscayne Bay is a skyscraper in Miami, Florida, United States.  It is located in northeastern Downtown, on Biscayne Bay along the west side of Biscayne Boulevard.  It opened for residential occupancy in early 2008.  The tower is 650 ft tall and has 63 floors.  The building currently stands as the 4th-tallest building in Miami and in the state of Florida, behind the Four Seasons Hotel Miami, Southeast Financial Center and Marquis Miami.  It also stands as tallest all-residential building in the city and the state.  900 Biscayne Bay is located across the street from Ten Museum Park, another recently completed Miami residential high-rise, near Museum Park and American Airlines Arena in northern Biscayne Boulevard.  It is also adjacent to the Park West Metromover station.  Originally planned to rise 712 feet (217 m) and 65 floors, the building went through a height reduction during its construction, with a decorative rooftop spire and two floors being removed from the final plans.

Indian Creek (Miami Beach): Indian Creek is a partly natural and partly man-made waterway in the city of Miami Beach, Florida, United States.  It starts as a man-made canal where Biscayne Bay meets Lincoln Road, and runs along Dade Boulevard, forming the boundary between South Beach and the rest of the city.  At 24th street the canal opens into the natural waterway and continues north through the city past Allison Island where it opens into Biscayne Bay, till 71st Street where it merges with Normandy and Tatum Waterways and is no longer called Indian Creek.

Thomas Kramer: Thomas Kramer is a German-born real estate developer and venture capitalist, and television personality, noteworthy for his part in the redevelopment of South Beach, Miami, Florida.  He is also a well-known high society figure and philanthropist, hosting charitable events at his Star Island (Miami Beach) mansion.

Rivo Alto Island: Rivo Alto Island is a neighborhood of South Beach in the city of Miami Beach on a man-made island in Biscayne Bay, Florida, United States.  It is one of the Venetian Islands, a chain of artificial islands in Biscayne Bay in the cities of Miami and Miami Beach.  It is between Di Lido Island and Belle Isle.  It is home to residential neighborhoods and a portion of the Venetian Causeway.

Di Lido Island: Di Lido Island is a neighborhood of South Beach in the city of Miami Beach on a man-made island in Biscayne Bay, Florida, United States.  It is the third island from the east of the Venetian Islands, a chain of artificial islands in Biscayne Bay in the cities of Miami and Miami Beach.  It is between San Marino Island and Rivo Alto Island.  It is home to residential neighborhoods and a portion of the Venetian Causeway.  The unfinished artificial island Isola di Lolando from the Florida land boom of the 1920s is located near the north tip of Di Lido Island.

Star Island (Miami Beach): Star Island is a neighborhood of South Beach in the city of Miami Beach on a man-made island in Biscayne Bay, Florida, United States.  The island is south of the Venetian Islands and just east of Palm and Hibiscus islands.

Supporting paragraphs: Thomas Kramer Star Island (Miami Beach)
Answer: Star Island