Exhibit A BEING a tract of land out of the L. M. Marshall Survey, Abstract No. 595, in the City of Plano, Collin County, Texas, being all of Lot 1B, Block A of Custer/190 Addition, an addition to the City of Plano according to the plat thereof recorded in Cabinet N, Page 106 of the Map Records of Collin County, Texas and being more particularly described as follows: BEGINNING at a 1/2" iron rod found in the north right-of-way line of Plano Parkway (variable width ROW) for the southwest corner of said Lot 1B and the southeast corner of Lot 2, Block 1 of Plano Parkway Business Center, an addition to the City of Plano according to the plat thereof recorded in Cabinet K, Page 896 of the Map Records of Collin County, Texas; THENCE with the east line of said Lot 2, North 00°22'10" East, a distance of 463.13 feet to a 1/2" iron rod found for corner in the south right-of-way line of a 15' wide alley for the beginning of a non-tangent curve to the left having a radius of 467.14 feet, a central angle of 13°42'57", a chord bearing and distance of South 82°46'22" East, 111.56 feet; THENCE with said south right-of-way line, the following courses and distances to wit: Southeasterly, with said curve, an arc distance of 111.83 feet to a 1/2" iron rod found for corner; South 89°37'50" East, a distance of 395.12 feet to a 1/2" iron rod found for the northwest corner of a tract of land described in deed to the City of Plano recorded in Volume 617, Page 369 of the Deed Records of Collin County, Texas; THENCE with the west line of said City of Plano tract, South 00°22'10" West, a distance of 150.00 feet to a 1/2" iron rod found for corner; THENCE with the south line of said City of Plano tract, South 89°37'50" East, a distance of 150.00 feet to a 1/2" iron rod found for corner; THENCE with the east line of said City of Plano tract, North 00°22'10" East, a distance of 150.00 feet to a 1/2" iron rod found for corner in the south right-of-way of said alley; THENCE with said south right-of-way line, South 89°37'50" East, a distance of 148.92 feet to an aluminum disk in concrete found for the northwest corner of Lot LA of said Custer/190 Addition; THENCE with the west line of said Lot 1A, South 00°22'12" West, a distance of 595.00 feet to an aluminum disk in concrete found in the north right-of-way line of said Plano Parkway; THENCE with said north right-of-way line, the following courses and distances to wit: North 89°37'50" West, a distance of 261.75 feet to a 1/2" iron rod found for corner at the beginning of a tangent curve to the right with a radius of 945.00 feet, a central angle of 22°00'00", and a chord bearing and distance of North 78°37'50" West, 360.63 feet; Northwesterly, with said curve, an arc distance of 362.85 feet to a 1/2" iron rod found for corner; North 67°37'50" West, a distance of 203.89 feet to the POINT OF BEGINNING and containing 9.840 acres or 428,618 square feet of land.