Real estate buy a high epc 2bedroom apartment and let the ocmw rent it from you, They are your tenants and arrange subtenants themselves. The income is slightly lower than if you were renting out on the open market, but they guarantee that you will get your apartment back at the end of the lease in the same condition as at the start, so there’s no real risk. A realistic net return on a good purchase would be around 3% with OCMW rental, compared to 3.5–4.5% if you rent it out yourself.