California-based Alexandria Real Estate Equities Inc. has recently closed six lease transactions totaling about 187,000 square feet at Alexandria Park at 128 in Bedford and Lexington.

Tenants in the transactions include 1366 Technologies Inc.; the Cystic Fibrosis Foundation; Emerald BioStructures; Life Technologies Corp.; Microbia Inc. and QD Vision Inc.

1366 Technologies, relocating and expanding from Lexington, will occupy 41,071 square feet at 6-8 Preston Court in Bedford. QD Vision, a nanomaterials products company, relocated and expanded from Watertown to 59,000 square feet at 29 Hartwell Avenue in Lexington. Microbia, a subsidiary of Koninklijke, renewed for 40,000 square feet at 60 Westview Street in Lexington, and Life Technologies renewed for 28,640 square feet at 35 Wiggins Avenue in Bedford.

The Cystic Fibrosis Foundation recently occupied a 6,633 square foot laboratory suite at 3 Preston Court, Bedford, and Emerald BioStructures leased 6,740 square feet of space in the same building.

Alexandria’s occupancy rate in the Route 128 submarket is currently 95.2 percent while the market for laboratory is approximately 88 percent, the company said.

In Greater Boston, Alexandria owns and operates approximately 3.5 million square feet of laboratory and office space for approximately 100 tenants.

Tamie Thompson of Jones Lang LaSalle is Alexandria’s leasing agent at Alexandria Park at 128.