Landlords in the 21st century are very often individuals who own only one or two properties to rent.And the growth of Buy-to-Let, which celebrated its tenth anniversary last year, as well as a rising demand by tenants, has seen more landlords entering the market.But the wise would-be landlord well do his or her homework well before embarking on this path, and that should start with a reputable letting agent who has specialist knowledge of that kind of property that will have the tenants flocking at the door.The Association of Residential Letting Agents has a wealth of advice and information for those involved in the Buy-to-Let business. The view of many lenders and all other housing professionals is that growth in the private rented sector must be encouraged.