The amount of time someone occupies a residential or commercial property will determine how affected they become by the overall fung shui of the building. For instance, a guest staying in a hotel for one or two nights will not be as affected by any adverse fung shui as a tenant who rents a tainted serviced apartment for a month.
Landlords are not directly affected by their units. If an office or apartment is near a hospital or cemetery, it's the tenants who will be prone to the associated illness and disturbances. Likewise, if the wealth sector of a unit is compromised, the occupants will have a higher probability of experiencing financial problems.
However, this does not mean that if you are looking to invest in a property, you can simply ignore fung shui principles if you are not going to occupy it. If your tenants frequently fall ill and move out immediately after their contract expires or they are consistently behind on their rent due to financial issues, you will be affected.
You may find yourself spending more than anticipated on renovations or repairs due to unforeseen circumstances. There may also be legal issues if you have conflict and disagreements with tenants.