Here are a few links to online estate agents offering residential and commercial properties in Ikaria.

Ikaria Real Estate – residential and commercial properties, and plots of land.
Tel / Fax: +0030 22750 31552.
Mobile Tel: +0030 69323 13642
Helena Mazari, Evdilos, Ikaria 83302.

Real Estate in Ikaria – residential and commercial properties, and plots of land. From the island-ikaria.com website.

ItsAboutGreece.com – a few parcels of land for building.