Extending an Islamic centre without the donor's permission

We have a small Muslim Community. One brother has given his building to use as a masjid, we named this "Kendal Islamic Centre" This building will remain under his name and we can use it without restrictions of time, when we can't afford to run it or we buy another place he takes the building back. We need to do extension and some building works in this building. Are we allowed to do chanda on the name of Kendal Islamic Centre or do we need to inform the donor's about our position in regards to it's ownership?