SHARING TELEPHONE SERVICES
Rockefeller Center, perhaps the nation's best-known office complex, is moving to offer its thousands of business tenants a new service. By this time next year, if things go as planned, companies will be able to buy their basic telephone service not from the New York Telephone Company, but from Rockefeller Center itself. Joining an increasing number of property managers in Manhattan and around the country, Rockefeller Center will provide a centralized telephone switchboard in each of its buildings - in much the same way it already provides such shared services as elevators, heating and air-conditioning. Installing such a switchboard will enable the buildings to get by with far fewer local telephone lines than they normally require, thus allowing tenants to save on their monthly bills. ''From the customer's view, Rockefeller Center will be the telephone company,'' said Jerome G. Lucas, president of Telestrategies Inc., a McLean, Va., communications consulting company.