The Infinity or 300 Spear Street is a mixed-use residential condominium development in the Rincon Hill neighborhood of San Francisco, California consisting of 2 high-rise towers and 2 low-rise buildings.

[7] The two residential projects, 300 Spear and 201 Folsom, were proposed by Tishman Speyer Properties and initially designed by Heller Manus Architects.

[7] The San Francisco Planning Commission was scheduled to give its vote on the two projects on June 26, 2003, but this was delayed until September.

[11] However, 300 Spear and 201 Folsom still needed approval from the San Francisco Board of Supervisors in order for the project to progress.

[18] The highrise towers rise above the earlier buildings in between the Embarcadero waterfront and Spear Street, making the complex prominent from places like the San Francisco Bay.