** London-exposed housebuilders and estate agents hit day'slows after UK chancellor George Osborne says in Budget govt will tighten non-dom tax rules
** Permanent non-dom status to be abolished
** Foxtons, Zoopla and Crest Nicholson down 3.8-4.2 pct
** Countrywide and Berkeley Group downc.2.3 pct
** Barratt Development, Persimmon andTaylor Wimpey top FTSE 100 losers
(RM: alasdair.pal.thomsonreuters.com@reuters.net)