I hope you've got lots of room! 1/35 scenery tends towards the large side, but there are quite a few manufacurers out there. The only problem is that a lot of them produce what amount to facades, designed with dioramas, rather than gaming in mind - & that whole buildings are quite expensive (Hansa System make some nice ones).
Fields Of Glory Models in the UK (
fieldsofglorymodels.co.uk) have a pretty good selection, so even if you're not UK based it could point out some possible manufacturers.
(There is also the doll's house/display model option - companies like
petite-properties.com do some nice stuff, though they unfortunately don't do 1/35 - you'd have to do some re-sizing of doors on either their 1/24 or 1/48 models.)