Built in 1925, the ''Grand Dame'' of El Cid is the most important Historic waterfront home of its era in West Palm Beach. The architectural splendor of the roaring twenties is bountiful in this unique masterpiece from the soaring ceiling heights right down to the original hardware on the windows. After welcoming you with priceless Pecky Cypress radius top double entry doors, the wrought iron and ''cast-in-place'' concrete staircase dominates the entry foyer and serves as the centerpiece of the home. From there, the living and family rooms are graced with original French doors that lead to the open waterfront patio. The views from every room across the massive front lawn to the Intracoastal Waterway and Palm Beach are breathtaking. The formal dining room and