There shall be made no use of the land herein described save and except in accord with the terms and conditions of these easements, and no structure shall be erected thereon or vegetation destroyed or altered, except in accord with these said terms and conditions, provided, however, that these terms and conditions may be amended at any time by an instrument signed by the grantor or his successor in interest and by the County and recorded among the land records of the said County. I. Terms and conditions of the Permanent Easement (Easement in Perpetuity) A. Uses permitted under the permanent easement shall be: 1. Agriculture, including the tilling of soil, raising of crops, raising of livestock and poultry, and the maintenance and operation of dairies, mills, hatcheries, and/or other processing operations serving and required by the crops and/or livestock or poultry grown or raised upon the land described herein only. 2. Nurseries, greenhouses, forestry, and horticultural enterprises, and the sale of the products of such uses, limited to sale of products grown on the land described herein. 3. Water conservation, water supply, flood and drainage control, and impounding facilities. 4. The single family dwelling, known as the "Salona" mansion and outbuildings and facilities, appurtenant thereto, whether or not occupied by grantor. Professional practice or medicine, dentistry, law, real estate or insurance sales, architecture, art or music instruction, engineering or land surveying, by an actual bona-fide resident of such dwelling is permitted. B. Uses, structures and acts expressly prohibited: 1. No building or other structure under the permanent easement shall hereafter be erected or allowed to remain upon the land herein described, provided that buildings and structures existing at the date of execution hereof, and additions thereto which do not increase grade level floor area by more than one hundred percent shall be permitted, and that small outbuildings and recreational facilities, including a swimming pool, may be constructed not closer than 200 feet to the mansion house known as "Salona".