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Most hardwood floors can be cleaned easily with a microfiber mop and a natural cleaner such as Mohawk's Floorcare Essentials Hardwood and Laminate Cleaner. It is all natural, works great and doesnt leave a hazy film on the floor. As with any product you use, make sure you test it first in a small area.
A tankless water heater can certainly be installed in a condominium - similar to any other structure. The easiest model is one that mounts externally - typically near the highest use of hot water or midway between multiple usage points. If there is some distance between the use locations, you can also install a D'mand pump to "call" the hot water so you are not wasting water waiting for the hot water to arrive. If you install a unit on the interior of your unit, e.g., in the previous water heater closet, the unit will require venting. And - FYI - one reason people love to install an on-demand is that you can actually repurpose a former water heater closet creating more useable space in your condo. One last piece of important information, you will need to check the size of your incoming water line. Typically water lines are 3/4 inches in diameter. On-demand units require incoming water lines of one inch. So you may need to upgrade your plumbing to accomodate the increased size of your incoming water lines. I hope that helps.
You will need to contact the DC Zoning Department to get information regarding your property setbacks. Once you get the information on restrictions or limitations in your area there can be a few ideas such as a closed in porch or even sunroom. I have a relative who lives on S Street and he built a two level deck on his townhouse. The areas, if similar to his, are somewhat small and narrow but can be manageable for new construction. Good luck on your project!
I would presume that there are restrictions in Washington which require the approval of an Urban Design Commission for any archietectural modification to an older structure. Such organizations operate with guidelines that are unique to your area.
I would suggest that you contact your local Building Department. Provide them with the name of your neighborhood and inquire of them "what if any restrictions limit your options".
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