Send me your floor plan and I'll do a quick conceptual drawing (no charge) to see if your 1-BR would work just fine as a 2 BR. Please include room dimensions. But first, please tell me: Do you need a second bedroom as a full-time bedroom, or a guest room or den/computer/TV room?
As for current selling market, it is improving, but still a bit slower than we real estate brokers, and sellers, prefer. Prices are rising slowly and steadily, so you'd do better now than 18 months ago. It is still a "buyer's market", so you would do well on the buy side.
But at the cost of NOT attracting you as a client for myself, I will tell you truthfully: If you can make your current apartment work as a 2-BR, and you love your building, your location, and your monthly carrying costs, why move? If it works well as a 2-BR, you will get more for it when you sell it in the future than as a 1-BR now!
Send me a floor plan. I'll help you. firstname.lastname@example.org or fax: 646 - 472 - 1209
Senior V.P., Managing Director
Brown Harris Stevens Residential Sales LLC