Some owners question the need to invest in tenant retention when it’s a landlords’ market. But at some point the market will change – it always does – and when it does, if you haven’t invested in your building, you will suffer a double-whammy: you’ll need to upgrade to attract new tenants, and you’ll have less money to do it with due to an increased vacancy rate. Even with an older building, creative thinking and a 7-year plan can keep you competitive…