It is important to distinguish between "condominium - a form of ownership" and "condominium - buying an apartment." People use the term both ways. Lots of multiple unit dwellings, including townhouses and semi-detached structures are condominiums, which describes the form of legal ownership. My community includes traditional apartments (one unit per each of three floors) and townhouses.

The reason I say this is that you have to look at comparable units. If it is a two-bedroom apartment, look at other two-bedroom apartments. If it is a townhouse or other type of unit, look at that kind of unit. 

Condo (in the sense of apartment) values tend to swing more broadly than  other kinds of properties because one new building can put 100 or more new units on the market in an instant. In Bethesda, where smart growth policies have encouraged the building of many new high-rise buildings, many of them apartment condos, the supply is high. However, given the demographics of this area - lots of recent grads, lots of empty-nesters looking to downsize, demand seems to be pretty high, too. So my guess is that depending on the kind of building (newer, more amenities) your price will probably be fairly stable. The older, garden-apartment style buildings - probably not so much.