For detailed information about how to create this kind of content you are probably better off looking for answers on the various blogging support sites and developing relationships with bloggers who work in this field. SEOMoz users are helpful, but there may not be many of them who blog about office interior design!

Interior designers need to publicise their work to keep getting work. Try making a list of designers then checking their websites & following them on Twitter/Facebook to see what they are/have been working on. You should be able to get names of designers from features in design magazines, reputable directories and professional interior design organisations.

Well written content introduces the main topic within the first few sentences, so should contain the most important keywords anyway. Emboldening those sentences will add a little weighting to their content so this should help your SEO rather than hinder it.